Fast Math Tricks - How to multiply 2 digit numbers up to 100 - the fast way! 

To anyone wondering what to do if your second set of numbers comes out in double digits, you put the left number in the blank space. Then you finish like normal simply adding that number and the one that would usually be in its place, and simply carrying the extra if those number come out over 9. Example: 12 x 15 1x1=1 and 2x5=10 So that’ll look like 110 Then 1x5 + 2x1 = 7 Now we take that 7 and add it to the 1 in the middle position and there’s our answer: 180 And to do big number you can just combine that with what he says in the video. Example: 79x88 7x8=56 and 9x8= 72 So we have 5672 Then of course 7x8=56 and 9x8=72 56+72=128 We then take that and combine it with our previous number 128 5672 Add that how it’s lined up there and you get 6952, and that’s our answer Hopefully this helps someone!

I hope its not too late to post a comment, sir, you cant imagine how far your lessons are reaching and how many minds are they changing , just for you. thank you, from the bottom of my heart.

I'm 38 years old and not very good at math. I blame myself out of anyone for this. I've watched a few of your videos so far and have learned more in regards to math than the past 36 years of my education. You are making math fun for me. The only thing that is holding me back now is mental math and doing these in my head. I'm working on that though. Thank you!

bruh I just graduated highschool and I'm only learning this now lmfao

Some times he just sounds like he is gonna burst into laughter😂

I am in school and the kids in my class look at me like i was from a diffrent planet when i said the answers correctly over and over again.

Oooohhh, this is FOIL method (First, Outer, Inner, Last). I did not realize that cause you explained it so well, and made it look so easy. Thank you for this sir!

Are the math lessons from 2011 helping? “Yes”

If you got 4 digits after the two first calculations, the use of the "_" must be avoided. e.g. 75x64 7x6=42 and 5x4=20, then you got 4220. (7x4)+(5X6)=58 4220 58 4800

This man has taught me more than my school

I was expecting this to be super complicated, but after watching 5 minutes of this video, I could solve each problem in around 10-15 seconds. I'm super happy right now.

Where the heck were you when I was in high school... I’ve watched 4 of your videos and I see teachers don’t teach these because once you get it... you don’t need anything else... you just became amazing.

Tecmath, I am a viewer and I love your math videos! One thing I hate though, is how you never explain it. Other kids at my school ask " Wow, you're good! How do you do the strategy?". I tell them the strategy. BUT, they wanna know WHY IT WORKS! So please explain why it works if it is less than somewhere around 10 minutes to explain. PLEASE like this so he can SEE IT! - A Student In Math

I learnt this in Primary School and the teacher called it the “ Rainbow “ method. ( P.s. you do the best math videos )

I got 704 3213 and 4182 in less than 2 minutes and I solved them mentally....☺️ Thanks a lot for this method 😄

Brilliantly and clearly said, additional points for brevity. Great video.

Your just an amazing teacher who inspires confidence and makes learning maths FUN!

You, solely, are going to get me passed my ITT Professional Numeracy Skills test! For that, I thank you!!!!

I love these videos. Thank you for sharing how to do seemingly complicated sums, easily. THE QUESTION REMAINS, WHY WERE WE NEVER TAUGHT (AND STILL NOT TAUGHT) TO DO MATHS THIS WAY IN SCHOOL?

I suffer from maths dyslexia and anything to do with maths make me come out in a sweat . You sir are a great teacher , love these maths tutorials. Thank you so much . I’ve subscribed

Love this guy he's getting me work up about math again

Thanks for the tutorial mate! This helps a lot!

You are so helpful because I don’t no how to do the column method for 2 digit by 2 digits so that’s really helped me out. Thanks😃

Thanks so much for this video. I have been wondering how to do these questions and now I know!

this video is really really helpful this time i got 99.7 in maths because of my fast multiplication compared to last time when i got 80.5

You're a great instructor. Thanks!

Why are we not teaching this in school?! Ive now gone from not knowing my times tables to multiplying double numbers! Awesome thanks!

Thanks for these tricks tecmath!

thank you so much. I have learned everything for your video the system of the math.

This is Amazing! Thank You Very Much!

I’ve always had a really good memory in mind for math but this would’ve made me look pretty incredible if I had mastered more of these as a kid, I need some shortcuts but there’s so many do you can learn it’s pretty cool! Never too old to learn.

Amazing! Just amazing mate! I didn't know there was a trick for this! Cheers!

This helps me a lot now I can spend less time trying to figure it out.

I love this video very much!!!, You have made multiplication simple to me!!! THANK YOU :)

You... good sir... have earned a subscriber and a LOT of likes because I’m probably might watch all you’re videos since there really helpful

I'm able to do these in my head with your method. Thank you,

Awesome !!! you've made calculation become easier now thanks alot :)

TecMath this is awesome!!!!! I'm feeling like a genius! And I can listen to your accent all day! This is exciting

Thanks for the vid mate!

I learnt this right in time yayy. Thank you so much sir, I really like your teaching style...

Thank you for helping me refreshing my math skills. I greatly appreciate it. Sure wish I had a math teacher like you growing up. Chances are I wouldn't have despised math as much. Thanks again!

This was so helpfull for me! Thank you so much for this teach! I'm not great at calculating... usually i calculate with the phone, but that is very good! Big like for you! 😊

Never heard of this 😱 luv this!

A very useful video Tecmath. Thanks so much.

Thanks brother for helping in such an easy and interesting way , it really made me tension free for my child's math multiplication problems that he has to solve without working, thanks again👍

YOU HELPED ME DO MY HOMEWORK BECAUSE WHAT THEY DO IS SOME COMPLICATED CARYING OVER like 10 times u saved my time

I love your topic sir. Thank you for sharing your knowledge to us. 🙂

This is absolutely the most helpful thing ive seen being in highschool.

Just one thing. The results of the second numbers being multiplied are single integers. I have practices where the product of the second numbers are two integers. I found that if you add the first digit of the product from the second integers to the sum of the products from the first and second integers (consecutively) it's correct.

I am happy to know this easy method Sir.....☺️ Thanks so much for the tutorial 🙏

Thank you for the video. I was doing this and realized that it is faster to do the equation backwards. Starting from the right side of the equation.

Thank you for posting this video, totally awesome! 😁🤘

+Tecmath, thanks for the multiplication method It really helped me, I really appreciate this method Thank you so much

This man deserves much more than 1 million sub

pretty straight and forward thank you for this

I just got a job that involves a LOT of mental multiplication and your videos are saving my LIFE! THANK YOU! :D :D

I would have failed grades without the internet THANK YOU!

Dude why tf doesn’t my school teach this 😭😂

Amazing! Thank you very much

I'm a banking student it is really helpful

Thank you so much for teaching and explaining things so thoroughly! I just showed off to my class and they were really impressed. I then taught them everything I learned form you, and it helped our class win the title of Best Class in Mathematics! Now I just need to remember these methods and not mix them up with all the other concepts u have taught 😂 Edit: By the way, I'm now like literally top 3 best in mental math and problem sum solvers thanks to you! Also lots of thanks to my math teacher in school, she teaches and explains things that can be understood almost immediately by the whole class; like you!

Thank you man i appreciate your work...I hope upcoming student should use this technique.

Thank you for ur explanations. Easy and quick.

Wish I’d have had you as my maths teacher when I was at school

The reverse FOIL process, that's genius!

Very useful trick, saves a lot of time in calculations, thanks a lot...

This one was the best explained!! Thanks! :))

You sounded so excited solving the third math problem 😂 Even I started to get excited and I don't even know why, I hate math 😂

THANKS A LOT. IT HELPS ME A LOT

OMG! I was searching for this video whole day thanks you saved my life!

Thank u so much!!! I really need help with math(I’m below standard on my grades) and this helps me a lot!!! ❤

If anyone else is wondering: For values like 66 and 44, When you do this method, you get the answer 28824, right? So what you do here, is that add the last '2' to the next digit, which would give 8+2= 10, then add that one to the next digit, you'd get 2904, which is the correct answer. Hope this helps you ;)

I've been testing myself with these to lock it down in my mind. I tried a tricky one - 59 x 33 where we have to employ a trick you didn't show and I'm delighted to find I actually got it right! Yay! I can do math!

Thanks for this! You make me love math.

This is amazing!!! 💪💪💪💪 thank you. Will start showing the to mu little ones 👊👌🤙

(51)(63) = (50 + 1)(60 + 3) = 50*60 + 1*3 + 50*3 + 1*60 = 3000 + 3 + 150 + 60 = 3003 + 210 = 3213 Open Letter to Educational Systems: teach kids how to do this fast math trick.. the reason why it works is because of distribution.. something that is fundamental for high school algebra.. teaching 4th graders how to multiple like this.. will let them naturally understand how to distribute later.. and we can leave FOIL to mean what it originally meant as a verb (to prevent from succeeding)

"Big brain time"

This video helped me al lot, especially in school. Thank you!

im subbing. you are the teacher i been looking for

Your voice was so good had to watch it again.

I swear this men sounds like he has so much confidence in me, and i don't even know him.

Thank you so helpful!

Really Helps Me Out Thank You 🙏🙏

These math tricks are useful. Would you please do a series on *why* these work? That would make them easier to remember, I think. Do the math the long hard way first, then point out what your shortcuts are doing.

oh my god where were you when I was in school!

This is brilliant & outstanding, this method is the best ever compare to others. Gracias

Thank you so much this video really helped me in so basics in maths👌👌

40% of the comments are wise guys trying to prove this method wrong because they don't know how to use it properly.

To multiply 3 digits numbers this way Eg: 127 x 23 - use the exact method as in video, leaving out the (100 value) of 127, so work out firstly 27 x 23 = 621 then add your second number (23) with 00 on the end to this: 621 add 23(00) like below. 621 2300 (second number in equation gets 00 behind) ------please read on - it gets exciting!!! ---------- 2921 or 156 x 42 (drop the 1) = 56 x 42 = 2352 2352 4200 (second number in equation gets 00 behind) --------- 6552 If you are multiplying 256 x 42 256 x 42 (drop the 2) = 56 x 42 = 2352 2352 4200 (second number in equation gets 00 behind) 4200 (add this value twice for every hundred value in your equation) --------- 10752

wow... simply amazing trick sir.... thanks for posting this vid

Thank you so much I liked the vid and subbed I feel like a genius now

We cannot use the underscore all the times. For example if we get the multiplication of both first two and last two numbers greater than or equal to 10 (As in case of 64*36, we get 6*3=18 and 4*6=24), we will write just four digits not the underscore (1824 not 18_24). Also if the first number is less than 10 and second one is greater than or equal to 10 (As in case of 34*23, we get 3*2=6 and 4*3=12), we will write just three digits not the underscore (612 not 6_12). I suggest a few rules for the general equation: ab*cd (e.g; 31*21) First Step [Let (a*c and b*d) = A]: 1) Don't use underscore: i) if you get 4 digit number after first operation: "a*c>9 and b*d>9" (e.g for 64*36, 1824) ii) if you get first number less then 10 and second greater than equal to 10: "a*c

This trick only works for some numbers but for others it doesn’t work ex. 67x39=18_63 Then 6x9=54 and 7x3=21 54+21=75 Then it will become 25,563 but when you do it on the calculator the answer is 2,613. Although I might be doing it wrong so if anyone figures it out could you please comment on how you did it? Thanks!

thank you very much for this but your voice is really soothing and really relaxing to hear on a tired day

This is what my 3rd grade teacher took 1 year to teach and you taught me in 6 min 26 seconds, bravo

This is how teachers should had teach me in school 😭

You were right in saying that probably half of us watching aren't even at school, I am one of those people haha

Thanks for this!

Absolutely brilliant!

Thanks.... Kal exam me kaam aaega