1 divided by 0 (a 3rd grade teacher & principal both got it wrong), Reddit r/NoStupidQuestions 

Rubbish. The answer is 1. Divide 1 by nothing, and you end up with 1, because it's undivided. Zero equals nothing.

As a programmer, division by zero is a practical concern, and a very common real world problem. We create systems that run math calculation on unknown variables, so it is necessary to put additional conditional logic into the routines, specifically to avoid division by zero - because most programming languages throw an error when that operation is tried. Almost every time division by zero is checked for, we usually just bypass the operation and return zero as default - because in almost every case that's the most suitable outcome for our practical concerns. So, really, division by zero should be zero. It would save a lot of electricity, and is arguably logically the best solution to the division by zero question.

“Math is a tool to solve problem in reality”. No, and thanks God it’s not that. It’s ALSO that, but not all knowledge derives from a practical problem. We can use reason and create math just for the pleasure of it, and sometimes what we built just as an exercise get used in a problem from reality

I'm horrible at math and even I remember "undefined". We are in serious trouble😮

​@darrenjpeters it won't work on a calculator it says can't divide by 0🤔 so 1 divided by 0 is 1 because it's not been divided by a number

The actual answer is "unplug your computer and spend time with your kid, and stop relying on everyone else to raise them."

​@@TheBigQQ69420You're awfully judgemental of someone who you know nothing about.

quick post it on /r/AITA instead of seeing the tree from the forest.@@TheOnceandFutureJake

@@TheBigQQ69420 I hope you have no kids.

@@TheBigQQ69420 Take your own advice. Get offline.

Reminds me of during the ticketing process for the Atlanta Olympics, a ticketing clerk was unaware that New Mexico was a US State and told the purchaser that they had to order tickets through their home country. "old Mexico- New Mexico....you have to order from your own country.."

@@jeffreyrichard2575 the amount of stories I’ve seen of people who don’t know that New Mexico is a U.S. state is alarming

With Google so handy….please look up and verify before you speak😊

@@qwenqwen1476 Huh? This was before Google.

@@qwenqwen1476 Better yet, get an actual education and KNOW THINGS instead of using Google as a crutch.

To infinity, and beyond!

But it isn't. And then it wouldn't make sense for "nothing" to be part of any operation.

Thanks for explaining it in a "dummy" way. I finally understand. My son is a maths teacher and he didn't get thru to me. 🌟

@@MrCmon113 You are right.

That’s a great explanation! I didn’t even know that. That makes a ton of sense! So 0 isn’t an amount; instead it represents a complete absence of anything that even could be quantifiable. Have I paraphrased that accurately?

The question itself is invalid. There is nothing to divide with. 1 divided with a blank space is not a math problem. 1 ÷ _. That is essentially what you have.

​@@deker0954exactly these mathprofrssord have no clue

I feel like as you move up in grade levels math teachers become more understanding of their errors / mistakes, especially since the concepts become a lot more complicated. My algebra and algebra 2 / pre-calc teachers would always mark off points for me without a second thought even though I would do the problems correctly, just not their method. Now with my Calc 3 teacher and my BC Calc teacher they would always be understanding and mess up at times. As you go up in math level teachers understand how complex math is more and more, so I think thats why many elementary school math teachers will do this sort of thing: they don't understand the higher level stuff

@@Thowe "just not their method" You have my sympathy. That always pissed me off.

Sounds like you are a good teacher. I am a university maths professor. The more I do mathematical research, the more I understand about how many things there are that I don't understand, but I enjoy learning new things all the time. I particularly like it when a student points out a mistake I have made, because then I know that someone understands and is following my argument. As I have taught for many years, I rarely get undergraduate questions that I cannot answer, which makes it less exciting in some ways. With graduate students it is completely different: more like a joint endeavour, approaching a problem where we don't always know what the answer will look like, or sometimes, we don't even know if there is an answer!

I am a teacher too. And I make mistakes, sometimes. And I used this opportunity to teach my students how to avoid making the same mistakes. To err is human. We all do that. It is just some doesn't choose this opportunity to grow.

When my youngest son was in high school taking AP algebra II, his techer did not understand the material. She would count some of his work wrong because the answers in the teacher book were wrong. He would have to prove to her that the book had the wrong answer. Unfortunately this happened more than you would expect from a school book publisher.

I am impressed, but you must be new to his channel because that's basically his thing and where the channel name comes from (Black Pen Red Pen -> bprp). It is indeed quite satisfying and I recommend you to watch some of his more advanced calculus videos where this skill is displayed in full potential.

​@@georgegkoumas5026I do the same but with pen. It hurts but the good kind.

It's an acquired skill. Spend enough time at a whiteboard, and you'll find yourself juggling markers with one hand. It's not terribly different from the skills we see older generations use with Blackboards.

@@meerak915, black boards require significantly more pressure to make a readable mark, and colored chalk is less common than colored markers. I have absolutely never seen anyone handle more than one piece of chalk at a time (unless the were using a specialized tool, such as for drawing music staves), and chalboards were still being used when I was in school.

I'm more impressed by the enormous stock of markers in the background

yes, so it' s one group of one. not " undefined". it just doesn't work the same as other numerals, ther e is no reason not to declare it an exception to the rule.

@@theCosmicQueen Uh, it is undefined. It's not a group of one. The answer to the crayon question isn't to just put the crayon on the floor or table. The question is asking her to give that single crayon to 0 groups, as in, give it to anyone, or put it on something, or even keep it yourself. It doesn't work. You can't give that crayon to nothing. That's why it's undefined.

She might just end up eating the crayon 😂

@@skyhong16in that case she still put it in the group “edible” 😊

This is a very unnecessary conflict blown out of proportion. You'd end up being burning bridges. Yes you can argue if you take 5 apples, multiply it zero times, "how many apples do you still have?" But blowing this out of proportion makes things worse. And thats what Yankees do

There is no either/or. It is undefined. Infinity is wrong.

@@beckywalker9450 Actually, there is an infinite number of 0s in one, so infinity as a possible answer can be defended. Undefined IS the better answer though - which is why I put it first.

​@@beckywalker9450 i mean if you think about it, the example in the video showing why dividing by 0 doesn't work won't work because the process would continue infinitely.

1/0 is undefined, and not infinity. The reason is, as you approach 0 from the positive side ( 0.0001 ) the answer indeed approaches infinity. But as you approach 0 from the negative side ( -0.0001 ) it approaches negative infinity. So the closer you get to 0, the answer becomes both positive infinity and negative infinity. Since it cannot be both at the same time, it is called “undefined”

Kruger-Dunning Phenomenon.

It's not embarrassment, it's ignorance. I'm inclined to think that both the principal and the teacher genuinely don't know. It's the dumbing down of a generation.

It is a skill every one of us has to learn when we are put into a position of authority. Whether a cop, a boss, a teacher, or a parent, we will eventually do something where we mess up and have to eat crow.

Sadly this is the trajectory society is heading and it's frightening to me.

@@klassike It's a club. The principal and the teacher are in an alliance against the parent. Our tribe must defeat their tribe, the winner is always correct.

Most teachers at my high school are barely older than the students. Its really weird

What does the principal know? He/she isn’t teaching math……shouldn’t the principal have gone to another for the answer?

@@valeriereneeharper I assume that the principal has graduated high school and hopefully at least a four year college... Everybody who has graduated high school should know the answer. This must be unique to the US and some third world countries where totally ignorant people can get education jobs.

@@johnj8069 Anyone who graduated grade school ought to know the answer. This is basic math, not advanced.

​@@dtreezybecause a lot of sorry students becoming teachers.

I had a good teacher but bad human ridicule me, pick on me for 2 years despite being one of the best students in all subjects. Idk what I make of this experience

Didnt they teach long division in school?

Actually more like 0/1 is their IQ

What a great way to engage kids and keep them interested!

It teaches critical thinking. They are trained to distrust his calculations and critically apply the rigorous concepts they have learned.

And this is the kind of teacher we all remember for the rest of our lives. The one that engages us, the one that gets us to think critically about what is presented. Everyone should have a teacher like this but unfortunately most never experience it.

He'll be taken out by the government soon for teaching independent thought to children Can't be having that now, how could our governments indoctrinate them on social media if we teach them to think for themselves? It's just not fair

I used to do similar in my junior high science classroom, changing up the prizes from time to time. Sometimes little plastic dinosaurs, bonus points, free time, etc. They were always hoping I'd make a mistake (and I usually did each period once a week or so...wink, wink).

My phones calculator literally said you can't divide by 0. 😂😂

@@tianamarie989 You got the pathetic reality. Even a machine is smarter than some of the teachers.

Mine says Error. I mean the Iphone calculator.

So infiniti is just undefined

@@UCRjGzq33NDIz-YPwfuDBM8A that state meant is just stupid. Computers are "smarter" as you put it than the entire history of humanity. Only limited to stuff with a system already built.

The Superintendent just sits on their ass all day, they don't stand anywhere

I’m telling you for schools with that much stupidity I don’t think anything would work. They exist.

They’ve gotta be high on drugs

Wonderful and scary simultaneously. I feel so fortunate that I grew up with a great school system. Even the same school system today probably sucks because the teachers are sadly representative of the majority of the population I fear.

@@sscarcliff this was 37 years ago…. I don’t even want to think about what it would be like there today!

We need to improve our education system!

@@TheKorbi yes, yes we do… more parents need to be involved in their kid's school… they needy tuo know what is being taught… because are schools are so bad, I took my own kid out and began homeschooling in 2019 before the plandemic hit the following year… best decision I ever made… I know exactly what is being taught and J's reading levels jumped 4 grades in a year…

Ugh same. There is so much crap being taught during the first two or three years in school. I remember being told that a small number minus a biggre number is unsolvable. Not tricky, not something that we learn later. Just unsolvable, period. I got scolded for naming letters of the alphabet by their names as my parents taught me. But instead of "Ah, beh, tseh, deh,..." in school I had to say "Ah, buh, tssss, duh, ...." Or else. It was fricking annoying. And ever since back then up to now, I never saw a reason to pick up my crushed respect for elementary school teachers.

I can see why they might have wanted to avoid explaining what a negative number is, but the modern way to teach little ones is with number lines and creating a negative number by "jumping over" the zero would have been easy for the teacher to demonstrate. Much better than outright saying your child was wrong.

Teacher fucked up on the initial situation but seems like a good teacher.

We had something similar with my daughter's teacher in primary school. My daughter is on the autistic spectrum and a lot of things were difficult for her at school. In maths she struggled with addition and subtraction. I spent time with her one weekend, using the classic column method (units, tens hundreds etc) and she got it almost immediately. She was calculating very large numbers easily and went to school proud with what she learned. Despite having the right answers the teacher told her she was wrong. At parents evening the teacher told me I was wrong for teaching my daughter that way because that year was all about number lines. I blew my stack. Teaching so rigidly could have set my daughter back that year and I'm glad that she was able to find a method that worked for her. That was a long time ago; she got a B at GCSE maths and has a science degree!

Why was this even a question asked of kids that age? Pretty simple to deal with it, don't mention it in the first place, and if any kids ask, tell them they will learn in more advanced classes

Teach your kid long division before 4th grade please. It is not that hard.

Most schools don't teach traditional math like long division anymore. I used to be a "brick and mortar" school teacher. I teach online now, and most of the kids I teach math to have NEVER seen traditional long division.

@@amy4484 Then how the heck do they divide big numbers by hand?

@@jakemccoy one hand holds the calculator, and the other presses the buttons. ;-P

@@jakemccoy Probably by using a similar thought process of finding max-multiples and subtracting them from the original value the same way we do for long division. The way we write long division is just an organizational pattern for recording the computation we're doing in our head, but it's equally effective to just jot down the numbers on a pad as we find them to reach the right answer, it's just not as pretty to read it back. How much you value readability of the process of solving VS the final answer being correct is what determines if learning long division as a tool is worthwhile.

I hope they sent the video to the principal who reinforced the teacher’s doubling-down of her error. This “teacher” is clearly too stubborn to admit she’s wrong. If the boss is embarrassed about being proven wrong, then there’s a better chance something might actually change.

​@@chrisschoenthaler5184chances are continuing this "fight" over something petty would make things worse. Thats why its so dangerous in the States

that’s so sweet :) it makes me happy to see adults encouraging kids to ask questions. as you said, i think it helps them be more capable of being able to speak up as well as critically think as they get older. if i were that teacher i’d be happy that one of my students was that attentive to still be thinking about it after school

I remember when it was discovered that the other gas giants had rings. Prior to that, only Saturn was thought to have rings.

That is a great teacher. We need more like him!

Out of curiosity, how old are you? I’m 51 and we were taught the giant planets all had rings, which I assumed was known for awhile. But I see Jupiter’s ring wasn’t discovered till 1979

@@spidey1z I'm in my early 30s, but the education for elementary schools here aren't very updated back when I was studying. I was lucky to have supplementary materials my parents gave us when we were interested in certain topics.

yeah, unfortunately many people think they're always right if the person correcting them is young

Yeah. Anything like World Health Organization, World ....

If someone with authority over you is simply wrong….. and this happens in school, in business, in life……. There’s honestly not much you can do 🤷🏼‍♂️ the strategy of, calmly and logically explain to them why they’re wrong, almost never works

Tell them to plug it into a calculator.

I always thought that X divided by zero would just be X. Thanks for clarifying that. I'm still confused why it's not X and why it's "undefined".

That makes senses, thank you.

Depends on the direction you are coming from tho

You are correct, except when approaching from the opposite direction the limit is NEGATIVE infinity. If not for that,the answer would clearly be infinity.

The mathematical definition excludes zero as the dividend. While your example shows the quotient tending toward infinity, the division atczero is "undefined."

What the graph actually shows is something called an asymptote-a value that is approached but never reached. f(x) = a/x shows asymptotes on both axes.

Great analogy :)

Shush you with the common sense answers.

if a tree falls in the forest and noone is around to hear it, does it make a sound

@@johnpaullogan1365unknown and impossible to know!

So the third grade teacher is standing around trying to give skittles to ghosts?

That teacher is an L

No way that guy is a teacher ☠☠ You should tell that to your science teacher

Which country are you from, may I ask

My 6th grade teacher said the Earth does a full rotation every day. Half by morning half by night. The classmate called her out LOL Edit: I meant Revolution. Enough with the inane replies.

@@shahanshahpolonium France

True

But that would be wrong because disagreeing with the teacher is insubordination. Even if the teacher is objectively wrong, it is morally wrong to embarrass the teacher and put their job in jeopardy. In the real world it works the same way. Especially if you have an advanced degree and you work for someone who doesn't. Helps saves you from getting fired, plus arguing about what diving by 0 gets you doesn't get you to the bottom line, namely making money, any faster - rather it delays it.

@@cryora Where do you live where being wrong as a teacher can put their job in jeopardy? I frequently disagreed and argued with teachers. I was often wrong, but sometimes teachers were too. No one ever got hurt, punished, or lost a job over it.

​@@cryorainsubordination? Wow that is a whack take. The teacher is the one who brought her boss into the conversation so, if they get embarrassed or fired it is their own fault.

Different world. That's why all the decent teachers have quit.@@Dojan5

Mark Twain?

@@ErokCherokee No, nobody said that. You're probably thinking of "Never argue with an idiot. They will drag you down to their level and beat you with experience." Which people CLAIM is a Mark Twain quote, but Mark Twain never said anything like that in his life. It's ultimately a common sentiment that slowly adapted over time, and it may have roots in Proverbs 26:4

Or " Who is the bigger fool? The fool? Or the one who argues with the fool?"

"It's easier to win an argument with a genius than a fool." -azranger7294

This is why cancel culture is horrific you can’t reason with the people who want to “cancel” others.

Yes but YOU are 1, so divide it by 1 not 0. If you want to share with 1 Friend, you would divide by 2 not 1, because YOU are 1 as well.

divide anything by 0, it means that first number remains undivided, thus it equals the first number. Math needs 0 as exception to the rules on that.

@@theCosmicQueen There already IS a number which you can divide by that leaves the first number unchanged and that is 1. Why would you need a second one. And it doesn't make sense from a continuity point of view. Divide by 1 -> Number stays the same. Divide by something bigger than 1 -> Number gets smaller, the bigger your divisor gets. Divide by something (positive) smaller than 1 -> Number gets bigger, the closer you get to 0. Why should dividing by 0 suddenly switch back to your first number? And why would there be an exception that dividing by 2 different numbers gets you the same result for 1 and 0 but not for ANY other 2 numbers?

@@NosyMo85 you would never divide by 1....but if you do not wanna share you divide by 0 ...

Windows calculator says "Cannot divide by zero."

My phone calculator says error so it is 0?

​@@Thedrizzle404android says the same thing

If your calculator is smart enough it will give you the actual answer, undefined.

@@Thedrizzle404 my android phone does the same thing.. lol

THIS

😂😂😂❤

mathemagician 😂

Teacher: **smashes apples with a sledge hammer.** "There. It's done." 😏

Might have been some sort of protocol for the school district to involve a principal at a certain point?

And the fact the principle came up with the same answer says a lot about the school as well. If anything I'd suggest this person bail from that school.

Yes. There is no doubt a BLM flag and a Trans flag in that Classroom. @@LibeliumDragonfly

​@@iinRezalright grandpa let's get you back to bed.

Its a reddit post, its fake.

Why are you putting your kids through that? Why are you paying taxes supporting this?

@@rustyshackelford3371 Because then they would go to prison for evading taxes? 😭😭

first time through i misread this as as "tried to explain pragmatism" and wondered why you brought text from an electrical engineering class to explain pragmatism, then i looked again and it made sense.

paramegnetism in 4th grade ? That is more than ambitious

@@tuseroni6085 lol same

And that.

A lot of things i don’t like about the Bay Area, but try that crap here and 3 parents with PHds in math will shut that principal and teacher down.

The audacity to presume one has the “authority” to override reality itself. It’s stuff like that that leads to all sorts of awful things in our world. In this situation, it didn’t matter much as it will probably be corrected in middle or high school. But imagine if it was something of serious ethical importance, and they still refused correction? Attitudes like that which do not care about reality can destroy lives. Here it couldn’t, but the same absurd refusal to acknowledge reality could be a serious danger in another situation. Humanity and civics needs to be developed in education. Without civics and ethics being taught, formed, practiced, and required all sorts of issues are bound to happen which are 100% preventable.

Wow you must be telepathic, to somehow know all that from the limited info in the video. Or are you personally involved deeply in the situation mentioned in the video? I'm willing to be you're straight up assuming many things and deciding a conclusion based on those unfounded assumptions. which makes you as bad as the teacher in the video. :) come down to earth, don't assume you know what's going on.

​@@scruffygaming627it's reality the teacher and principle are both wrong. The error was pointed out and yet they double down on asserting something wrong. Why do you excuse it and want to let it slide ? Tolerating nonsense is tearing society apart.

Clearly this teacher is not "the expert". It doesn't take any type of expertise at all to know you can't divide anything by 0 (aside from this video explaining it very well all you have to do is just think about it for like 5 seconds). The teacher and the principal are idiots.

Most teachers learn the lesson plan just before the class and forget it after the class is over. They just regurgitate what is on the lesson without critical thought or really knowing the subject. There was none of this undefined crap when i was in school. 3 divided by nothing at all is still 3 because you did not do anything to it to divide it. Same with 1 divided by 0 which is 1. I was taught any number divided by zero is always going to be that number as it cannot be anything else. To say it's undefined when it really is easily defined is Really Dumb.

@@DivergentDroid I mean that's not really...how it works. Undefined isn't a new concept, you just weren't taught it before.

@@TheRythimMan I don't care what you say because you don't have the mental capacity to know how stupid it is. If you have 5 fingers and you take nothing away from them meaning you do not divide or split them at all, you still have 5 fingers. It's the exact same as dividing by zero. It's essentially telling you, you are not dividing anything at all from anything. Now I do understand why you cannot see the problem, you are taught by your uneducated teachers that you live on a sphere in a vacuum that has a sphere shaped atmosphere that fails to behave as gas laws and the laws of thermodynamics tell us gas must behave. You already believe so many lies you cannot see a fact in front of your face.

@@DivergentDroid Someone with a brain🎯😎☕

"Any number divided by 1 is 0." Huh? Any number divided by 1 is the original number.

Carol, you have let yourself down, any number divided by one is the same number, smh my head

Much respect for your willingness to question and check. I had a doc (MD - and you know their rep for having the god complex) one time who listened to my description, flipped open a book, and showed me a picture. "Is this what you're seeing," he asked me. "Yes." I was so impressed. Clear comms. Good info. Correct diagnosis and treatment. Same story, much respect.

But Nenah Cherry asked her teacher why the sky was blue and not white, and the teacher wouldn't answer her.

@@mikestone5595 maybe because the teacher doesn't know the answer to it. Don't assume teachers know the answer to everything. I personally like when my kids asks questions no matter how ridiculous those questions maybe.

Your job isn't to know everything. You just have to teach our kids how to find out anything. And it sounds like you're doing that!

"It's not what you don't know that gets you in trouble, it's what you do know that just ain't so" --possibly Twain?

They don't even teach math properly anymore from my perspective. Oddly enough I was one of just a few kids that liked proving math because my dad was so into computers, even in the 70s. it was nuts but to this day that old school math is used in my tech job with scripting so I still have interest but I had to show my own child how to do it against the public school process. Education has fallen off the deep end, today 2x2=oppression.

I was taught this it is 0. I'm 40. Nothing has changed.

Well, I honestly forgot so I appreciate the reminder.

@@Kitsuragi556True, it’s very possible that this teacher and principal don’t even exist

@@Kitsuragi556 As much as I hope you’re correct about this it wouldn’t surprise me that was a true, unembellished story. I went through ALL of elementary, junior high, high school, and college (with a bachelor’s in the STEM area) with a miss understanding of the order of operations because my 2nd grade teacher taught it improperly. Failed to mention that multiplication and division were equal to each other. The same with addition and subtraction. Always thought it was parentheses, exponents, multiplication, division, addition, and then subtraction; Only in that order not the correct way of parentheses, exponents, multiplication/division (left to right), and then addition/subtraction (left to right). I don’t know how no teacher ever noticed/cared Kindergarten to Collegiate to correct me. It took a fricken RU-vid video that I stumbled across accidentally and subsequent investigation for me learn a basic math rule.

i think the teacher would think that calculator has error instead...

She, like many educators today, is disenchanted with math, clearly. The best solution is to fill in the necessary gaps with your child. I know we WANT all teachers to teach well, but this isn’t the land of imagination, so the effort will need to come from the parents, overall. I am so lucky I don’t have kids! 😂

this is so ridiculous that i am going to say that reddit post is a lie

Actually, the answer is "undefined" per Google. Also, doing the math on my mini calculator (1 ÷ 0), the answer is 0 (zero). 1 ÷ 1 = 1. So, we'd not get the same result for 1 ÷ 0. At any rate, the better answer here - probably - is "undefined."

I just verified it. It doesn't even say error, it directly said can't divide by zero😂

exactly. Because zero can not even converge to a value, positive or negative. It is simply nonsensical to divide by zero.

@@escapegulag4317 Actually, the whole explanation in calculus as far as "undefined" is that it DOES approach both positive infinity and negative infinity and that's why it's not defined. Take 1/0.1=10; 1/0.01=100, etc... 1/-0.1=-10; 1/-0.01=-100, etc... so as both of them approach zero, they'll end up in two different places, i.e., positive or negative infinity. Easy fix to it actually... just rip out the piece of paper and fold it back onto itself, so that both infinities meet at the same point. You've now created (absolute) infinity and negative infinity = positive infinite. Now it's a number rather than a concept and after googling "Riemann Sphere" you can move on to "Wheel Theory" to understand how you can deal with 0/0.

Actually you can divide by zero, it's just that a calculator says that on purpose so it doesn't become a black hole.

dividing by zero requires a undefined condition outside the pure problem. look at it this way. in a word problem. there is one apple on the table. divide the apple for two people, and you get one half. divide it for one person you get 1 apple. and divide by zero people you get 0 apples when you define how many apples do people get. when you define how many apples are there, you still get one. so, take 0 apples and divide it between two people? you get zero apples left and zero apples for the kids to eat. they are the same, they do not need to be defined. this make sense? for any number to make sense, the problem must be fully defined, and dividing any nuber by zero without context expressed in the problem cannot be solved, because there is no slot for the numbers to fall into.

It was like the FIRST thing we were taught lmao. How does anyone get hired by a school and they can't do 2nd grade math...

Refusing to admit fault is also a fantastic way to get your students to hate you. I'm still pissed at a history teacher who gave me a zero on an all or nothing quiz because of one question that I didn't get wrong. He was wrong, but refused to admit it and my grade suffered. It's been years but I'm still mad about it.

kudos to the host of leaving the silly school politics out. imo the organic answer that cannot be calculated or arrived at by formula is - one. for example if there is one pie and there are zero people sharing the pie..... you have one pie. this is a rare example in mathematics where you truly have to think outside the box.

Is it possible to graph a decimal in Cartesian plane?

@@Aaron_1112-- yes it's possible.... i've done this on an boeing plane.

If you have one apple and you divided by no apples, how many apples do you have one apple?

jep politicians are prime example

Last lesson to learn is "just because they're wrong doesn't mean the situation allows you to ignore their authority", the harshest one

Yeah primes them for working for CEOs for the rest of their lives.

Most authorities are just people born in the right family.

Imagine only learning when you're an adult that adults are still idiots...

It's like being taught operator precedence throughout the school tiers. The true method is PEMA.

I would just pull my kid aside and say “mr. teacher is an idiot” and explain the concept myself.

Schools are small gulags of a socialist system.

I would just change schools, especially since in the last year we’ve seen a lot of people who agree with me that if people in charge are doing stupid things, you best off going to places where they’re not in charge

@@S8EdgyVA This is too small an issue to change schools over. But if there are a lot of these, then perhaps. In a large city, changing schools might be possible, but in a small city, no. I grew up in a city of around 10,000, which was the biggest city in 100 miles. The next high school was 25 miles away.

“Reason and logic won’t work” The one person in the comments who gets it

you had a stick you just didnt do anyhing to it , so you still have a stick. 1% 0 is 1 0% 1 is 0 you had nothing and still have nothing . caint divide nothing into parts of something..

Well, you actually can divide by zero (in a way)... you just have to be specific on how you'd want to do it - else you'll get "undefined" as an answer. If you form the derivation of a function you pretty much divide by zero (while forming the limit), but in a very specific way.

"If I have 0 sticks, how many times should I whack you for you to feel five levels of pain?"

You have zero dollars now divide that one time.

@@lythonoise Zero can be divided by anything (except zero) and always give out zero: I have zero cakes and I keep those for my self (divide by one) = I still have zero cakes. I have zero cakes and share them equally with 6 other people (divide by seven) = we all have zero cakes. Problem starts when you have something and try to divide by zero. If I have one cake and keep it to myself then I divide by one, if I share it with those other people then I divide by seven... ...but how do i equally distribute one cake to zero people?

Dude ive had nurses tell me certain drugs are not used for their SCIENTIFICALLY proven purpose but " just get you high so you forget about ______". No understanding of receptor activity or how this substance blocks signals in parts of the brain. Nope it just gets you high. I was stunned a RN a TRAINED nurse knows less about stuff she is perscribing than i do. And we wonder why opioids where an issue? Maybe its cause Humans REFUSE to educate themselves fully before thinking they know something

Some of the dumbest people i've met were teachers

Someone needed to bring that poor lady a prism

Maybe she was talking about the people who use it as the flag.

Generally you are right about the orders of colors in a first-order rainbow. Please take the second order of refraction into consideration where the order of colors is inverted and the intensity is greatly reduced.

Many people don't realise that maps have to adjust size to be able to coherently project what's on a globe to a rectangle. More people should be aware of that as a common knowledge...

Yeah maps are projections. They are never to scale. There are a few interesting and well designed maps that attempt to show everything to scale though. Not useful outside of that specific purpose though. Although I suppose a globe would be more accurate.

@@An.Unsought.Thought Why do people not just own globes.

the number of people that get this wrong and don't even know.. is too damn high!

Ah, Mr Mercator

I noticed that too! Seamless switching

I know, right? I thought he had a real “magic marker” until I actually noticed he was holding both colours! 😅

Well... He is Asian after all

But we don't know, if it's by intention or just randomly.

Sure you do. Questions in blue, answers in red. Seemed pretty orderly, consistent, and deliberate to me.

Or just skip to the end. Change schools.

​@@khatdubell yes

@@khatdubell I think it would be fair to give them a chance to realize, that they had misunderstood some basic math, and then rectify it... And I would be surprised if they would still double down, if shown in a proper math-book.

@@DanildFlamme But they _had_ that chance. And they _did_ double down.

Even simpler. Ask them to pull out their cell phone and show you that 1 divided by 0 equals 0. When their “all knowing” device’s calculator throws an Error they should be sufficiently bamboozled into capitulating that the problem is not as straight as they thought.

I didn't realize it until you said it. But it also helped with following what was being explained. This guy is a really good teacher.

He truly a wizard with the markers.

I managed to teach myself how to switch between two pens while holding them both in the same hand like that at some point in middle or highschool. The next year tho, I'd completely forgotten how I did it, and I still cant do it anymore.

I mean I knew he used different colors, I didn't even realize he did it seamlessly. That was smooth as soft butter

@@PanoptesDreamsExactly. It did help a lot and the transition so quick there was no distraction yet the color change did make it more clear. Was like a magic show. At first I thought the colors were changed in post with digital editing. Nope.

What did the teacher say the Sun was? A big flashlight?

@@chapagawa I can’t remember exactly. I think she said it was simply ‘the sun’ and the only one

What is a "supply teacher?"

@@Narsuitus it’s usually a semi qualified/trainee teacher who works part time helping the regular teacher

@@alanhaynes9672 Well, I guess if you limit the scope of the investigation to our solar system, she could be right…. Sorry for your child’s embarrassment for being right, but a good lesson from Twain “Whenever you find yourself on the side of the majority, it is time to pause and reflect.”

I mean you’re a grown up now, with greater cognitive depth to be able to easily comprehend what is said. Your teachers probably taught you the same way

​@@bales1569I've never understood long division through all of my schooling, and never had it taught to me in an understandable (to me) way. Watching this, it just clicked. And I don't believe I am much smarter than when I left high school 3 years ago

@@braydos1578 you actually are you don't realize but most people use basic math almost every day. Don't just put yourself down you should recognize that you are more intelligent.

he taught the old school way.... today is the new math..... the old math is racist. lol sorry had to say it.

Im not out of school and same

Generally, algebra uses a lot of logic to solve equations. It doesn't require someone to be good at arithmetic.

@@chucksucks8640I would argue otherwise, algebra is mostly variable manipulation, solving systems, and basic arithmetic

My third grade teacher insisted that it wasn't possible to subtract a larger number from a smaller one, and she made a big thing about it, too. She could have just said that there was something called negative numbers that we'd be learning about in a couple years, but that we wouldn't be learning about them in that class. But no, she had to insist to everyone that it wasn't possible.

@@Mark73 well to be fair she was right, it wasn't possible in her class

Except her class isn’t even close in the end goal. She’s a mere fraction of the entire infrastructure. Better to show students a glimpse of the entire picture than telling them some bs lie which will cause more confusion down the line

Not a scrabbler that's for sure

I remember in 5th grade i learned the proverb "all work and no play makes jack a dull boy" from reading little house on the prairie. I used it in an essay and was proud of myself for being able to include something I learned all by myself. My teacher docked me points and said using that phrase was too advanced for my grade. Same teacher also sat me next to the troublemaker kid to "control" him and scolded ME when the boy cheated by copying answers from my tests.

I think I was in first grade when I was talking about a book I’d read and verbally used the phrase “horse’s foreleg” because I’d learned it from the book. My teacher just looked at me for a second and slowly said, “Yes… horses have… four legs…” That’s the first time I can recall thinking that an adult was dumb for not knowing something I knew.

Damn dude, that's harsh, wish I could have lent you my mother for the occasion, she woulda rattled that teacher outta her socks. Her life would never be the same.

@@PinkieSugar Jesus Christ, don't y'all have parents to go shake down the principal?

I think it's clear they were a regular principal, not a mathematic principal...

Yeah, there are many thousands of people that think you can spend your way out of debt.

Ignorance of math is no excuse! Any one who says different is a ignorant peasant and will be treated as one.

@@solarsynapse all of them Americans.

They wouldn’t be teaching little kids if they ware capable. We respect teachers but that doesn’t make them geniuses, far from that. Anyone who’s average or even slightly below can teach children. Capable children will achieve success regardless. World is full of excuses.

I knew of a teacher that taught that the earth was flat, after watching the Apollo landing on TV. Teachers, like parents, are fallible. Thank goodness the vast majority of teachers are competent.

Teachers are not the best salesmen for a college education.

My high school biology teacher taught us the parts of the eye: the black dot in the middle is the pupil, the colored part around that is the cornea, and the white part around that is the iris. If I hadn’t learned the proper parts, I would have been so confused when Stargate:SG1 came out and they’d “close the iris” to stop someone from coming in.

Situations like that are teachable moments. If you don't know, teach them _how_ to find out. "I'm not sure. Let's find out together (but without Wikipedia)."

Back in 1970 my mom worked for the assistant principal at the high school. One day a kid who usually came in because of causing trouble came to ask my mom for help. He said the math teacher couldn't explain & help with a problem & he was really trying to do his work so he could get a job he wanted. My mom got the advanced math teacher to help him. That teacher said the problem was the other guy was an education major. He said more and more teachers were getting a degree in education instead of getting a degree in a subject then taking the extra classes to get a teaching credential. Think how much things have gone downhill in our schools since then.

Not math related, but still ignorance related. In 2011 I wrote a 7 page biography on Barack Obama for a paper. We were using TurnItIn to check for plagiarism, plagiarism checkers were fairly new. 5% of my paper was paraphrased from sources I used. 47% of my paper was similar to over 50 other student's papers because Obama was a very hot topic, after all there's only a few ways to write "Obama was the 44th president" Anyways she refused to believe I didn't source 50 other papers and paraphrase 1 sentence from each so I got -52% for plagiarism 😒. I feel bad for students who might get false flagged for AI papers today

Yes, they are called democrats!

It's obviously too late now but I would just point out to the teacher all the times in which the SAT has been wrong in the past and been correctly called out by students, not teachers. Veritasium just posted a video about a notable example of it.

That's crazy because I always thought those "which one is a cube" questions were insanely easy

The fact you went to the effort to actually make that cube net and demonstrate it shows you're going to go far if you ever take up a STEM subject! You're willing to physically test a hypothesis!

Twain had the best cameo in Star Trek ever.

I'm not supporting the teacher, but even I would tell the kids that it is zero.... Because they don't have to understand it at their young age, if you stuff their head with all the concepts of math then they will start to hate math even before trying.... A genius in math can become scientist and professor teaching 100z of students, but he will be a terrible teacher for young kids when they are still learning numbers..... Bcs he doesn't help them understand, but he will only make it worse....

@@ryuk4142 You shouldn't tell them that because it's wrong. Any finite number divided by zero isn't zero. It's infinity. It is quite literally the opposite of zero. Besides, if you teach them that multiplication and division are inverse operators (which they are) it will confuse them more when you at the same time tell them that said inverse operators will return the same result.

I guarantee the teacher has a penchant for multicoloured flags ...

@@sci_ent_ificsui_neg9236 And eighteen Ukraine flags next to their X profile.

Yes!. Zero cannot be used as a divisor.

You can divide by 0, you just need more information is all. Because dividing by 0 gives you two answers. Infinity and negative infinity. That's why it's undefined, not impossible. "Divide 1 by 0 assuming you approach 0 from the positive side." This actually can be divided, giving you the answer of infinity

@@poa2.0surface77 Buying something is not division. It's subtraction. But I'll explain why dividing by zero gives you both infinity and negative infinity. 1/1=1 1/0.1=10 1/0.01=100 1/0.001=1,000. As you get closer to 0, the result gets higher and higher. When you reach 0, you've reached infinity. Why this results in negative infinity is because it works the other way as well. 1/-1=-1 1/-0.1=-10 1/-0.01=-100 1/-0.001=-1,000. So as you reach 0, you also get negative infinity. This is why dividing by 0 is undefined. Not impossible.

@@poa2.0surface77 In order for 1/0 = 1 to be true it would also have to be true that 1x 0 =1 and it does not. It equals 0

@@poa2.0surface77 0 x1 means repetition of 0, 1 time which is 0, or it also means repetition of 1, 0 times which again is equal to 0. (hmmm, you know, the concept of nothing) Perhaps you've forgotten that multiplication is simply repeated additions.

Eliminate school taxes and make parents solely responsible for paying for their children's "education" and the schools would be forced to change their approach.

And things not falling down is quite basic!

​@@garthornspike3648Yeah, that won't work

@@garthornspike3648”Only the wealthy should get an education” is a wildly stupid idea.

@@garthornspike3648 that's not going to work. The rich would hog all the better teachers while the majority of us middle/low and peasants would get mediocre lower status, fish (newbie) teachers. The best way is to invest in higher education or outside education from the public school. It's an add on. That way, the student can be ahead of current level. Many Asian parents put more classes like math, reading and etc in the East.

I typed 1 ÷ 0 to a calculator when I was a kid because I was confused when my teacher said anything divided by 0 is 0. The answer it returned is 0.

@@speedytempo3819 Old electromechanical calculators WILL actually attempt this. The answer will start counting up from 1 and will continue to count up until you press the button to stop the calculation. You can also subtract 1 from zero and come up with all 9's (actually the way that negative numbers are stored in binary fields in computers).

​@@speedytempo3819 My phone calculator responded = Cannot divide by zero

​@@speedytempo3819 Old calculators return " *E* 0" . It means division by zero error.

Well, when I tried this 1÷0=error on my calculator but if you reverse it and put 0÷1=0 on same calculator.

It's all the same at any grade level.

Actually, catsup is still likely wrong depending on the context. Ketchup is a very legally specific term referring to a very specific foodstuff made with a specific proportion of ingredients. If a manufacturer deviates from the legally defined ingredients, they can no longer legally define their product as "ketchup." "Catsup" is to "ketchup" what "creme" is to "cream." "Catsup" is a ketchup-like tomato concoction (and in some cases abomination) that does not meet the strict legal requirements to be labeled as "ketchup." So, yes it is ketchup, and anyone who tries to tell you that their "catsup" is ketchup is at best misinformed, and at worst comitting food labeling law violations. Just to be safe your teacher should probably be investigated by the FDA, the FTC, the CFPB, and the USDA. It's the only way to be sure ;)

Yes, "correctness" in spelling was the first to go! Then there are the "englishes".

​@sophiedowney1077 Yes coz that's the detail 6-7 years olds would be worried about 😂 Good lord!

@@sophiedowney1077I feel like you made up some of those letter names. I freely admit I could be, and most likely am, wrong about that, but it just feels made up.

​@richardwilliams3080 Food And Drug administration, Federal Trade Commission, Consumer Finance Protection Board, and United States Department of Agriculture, respectively.

But then it must be explained how to handle the situation tactfully to avoid pissing off those who take their own authority too seriously. In addition, only really secure people can admit when they’re wrong and take correction graciously.

It is a fine balance. Especially in your youth there is a lot of inexperience and your thinking at say 15 or 22 won't be the same as it is when you are 40 or 60. Sometimes there is a lot of wisdom in what others have to say that you have to decide if it is worth trusting over your own thoughts. Often our blind spots when we are young are pretty big and being able to see those tends to take time.

Quite a good way to have your kid doubt you (as an authority figure, you become dubious too😅) and thus what you say. Thus making authority figures reliables. Bit then it means you were right and then... /Illogical circle met/

Authority figures usually know a lot less than everyone else. They're just in the violence game.

@@dennissilber287There is no amount of tactfulness which is appropriate to display for a tyrant. You treat them how they act. You do not submit.

In natural numbers, yes. In real numbers, it's also a neutral value, with several properties defining its behavior within the construction.

But dividing 1/0 is the equivalent of multiplying 0^-1 by 1^1. No area of mathematics has an equal answer. In algebra it's left defined as "1", since according to the construction, any number with an exponent of 0 will become 1, but analytical mathematicians leave this as undefined. In a nutshell, there is no universal answer because different areas of math need different values for different purposes.

I was a math teacher. My students were encouraged to point out my mistakes. It happens.

"without hurting her feelings" is not the concern. the concern is "without retaliation on my child."

So I had a similar experience in high school. My teacher was adamant that you can assume nothing in geometry. So when the test contained a bunch of intersecting "lines" and angle measurements that traveled through a center point. We were not allowed to use a protractor. I answered that quite a few of the questions could not be answered because nothing could prove that the line segments that traveled through the center point were actually "straight" lines. the lines could have been 179.999 degrees or 180.001 or any other minor offset. The teacher knew I was very capable in mathematics and I would not get this material wrong but marked them all incorrect anyway... in their mind rightfully so. so I discussed my thought process with the teacher and at one point I was told "I can't make your answers correct because then everyone else is wrong." gotta love that one. so I ended up with a 77 on the test.... However in the end the teacher gave me a +5 to my final grade for the semester. So all was not lost and my thought process was proven valid. Still to this day the "I can't make you right because then everyone else is wrong" stuck with me... not just in math but in general for life. Being right is a good thing, but when it goes against the accepted you better be damn well prepared to explain why you are right. and even if you succeed you may not get what you deserve. That person should not be teaching math to anyone. not even Kindergartners in my opinion.

@@jeanmartin963 That's more or less the same thing.

@@johncubbage1623 You are a person who sticks to their guns against all odds when you are convinced you are right. History is full of people like that, most had to first suffer for their convictions before being recognised.

I work in a hospital and I can say with full confidence that the doctors are the dumbest people there.

Good working theory. I remember being very frustrated with this as a kid too, a lot of language teachers don’t know what they’re doing either, just like math and science teachers unfortunately.

This explains why I flunked out. Thank you!!!!

To be successful in America, all you need is to be confident, convincing, and loud. Helps to be good looking too. Intelligence barely plays any factor.

Less so at the college level, but often teachers are not given a choice of what they teach but rather have to teach what nobody else wants or administration doesn't have a specialist for. At least where I live, nurses make far more money than teachers do and even more than all but senior professors. So where is the incentive? Society does not value teachers much these days. I wouldn't become a teacher even though I realize how important it is.

no it's dividing zero by anything is 0. I'm a programmer and as a programmer 1/0 = error but 0/1=0