Fast Maths Trick of Calculation 

Wow, I must say, this is pure genius! As a young boy in school, I found math really boring, so I never paid attention to it. But, if I would of had a teacher like you to make it fun and exciting, I would of surely found pleasure in it and finished high school with flying colors! Thank you for the videos. Please make more. Some people really need it!

5000+ people found my EasyCal Video intellectually 'arousing' and thoughtfully "stimulating" :) Shahryar Badar Khan (Glad2teach)

My friend it is alwasy you who posts such wonderful remarks below all my videos. Your comments ooze out sincerity, gratitude, respect and blessings. I am humbled and indebted by all your best wishes. Thank You Shahryar Badar Khan (glad2teach)

Dear ninjaboi195 , the EasyCal Video Series is my very humble attempt to demystify and simplify the subject of Mathematics. Glad that a Million and half people have watched these videos and benefitted from them.

Haha nice video and I love how you say "isn't it?"

Hmmm... I calculate like this; 13 x 12 = 13x10(130)+ 2x13(26) = 156... It's easier and faster for me.

In the same way you can easily multiply numbers above Base 20 as well. See my 3rd video on Glad2teach website (link given below this vid )

Hi Shahryar. I'm 16 and I've had alot of problems with maths and I've never really liked it either but you have made it so simple and fun I could not show enough gratitude for what you have done. THANK YOU.

If 666 is an evil number, does that make 25.8069758 the root of all evil?

my trick, 13 × 12 3×2 = 6 (last num) 1×1 = 1 (First num) 3×1 = 3 & 1×2 = 2 (3+2=5) =156 very easy.

Dear PaganEnergy, thanks for your sincere appreciation. As a teacher I always try to make Mathematics interesting. Half the battle is won as soon as a student stops associating Math with boredom and starts enjoying its challenges and complexities. After all "Adventure" is nothing but a "difficulty" perceived the right way. Don't the children enjoy playing Video games. These new age computer Games are far more difficult than any question found in Math textbooks.

Dear BigBirdPhila, the EasyCal technique shown in my video above is to help students calculate mentally tables upto 20 x 20 . As most students pass out of their schools without even knowing tables till 20 x 10. But you can use the same technique to multiply numbers in 20's as well. Like 21 is at the distance of 11 from Base10. However the smarter way would be to choose base20 for 21. Have you watched the 3rd video on glad2teach website ( link below the video )

You sir have a new subscriber

Not working after 20 table

This is why I love the internet. Not practical in every situation, but having tricks like this helps students immensely.

Your tutorials have made my life incredibly enjoyable. Thank you.

trouble shots at 14×14

This is like so cooooooooooooooooooooooollllll!!!!!!

Your are welcome Lasseklorenz. Btw the 3 more easycal videos on glad2teach website as also playing well ( I checked them in chrome as well ). Direct link to the website is given below the video above. Shahryar Badar Khan (Glad2teach)

It gives me immense pride when I see that my EasyCal Videos have been watched and appreciated by 2 Million people from world over.

Not 5 minutes 5 minutes and 1 second.

@Pranavkh, problem with using Distributive Property ( that you have used) is that a student would have to know tables till 20. EasyCal trick I have shown works even if tables till 10 are known. For Eg: 18 * 16 = ? Using your method, 18 x (10 + 6) = 18*10 + 18*6 = 180 + ( now I need to know what 18 times 6 is or once again I would have to use the Distributive property ) Using EasyCal Trick: 18 * 16 = ? Add 18+6 , we get 24_ or 240. Now find 8 x 6 = 48 . So 240+48 = 288 ( ANSWER)

The concept of Base10 is indeed the most important concept in faster Arithmetic. Glad that I could help you.

This is great. Never thought you could do it like this. I'm still a mathgenious by far, but this is a step forward. Do you also have something about calculating percentages etcetera?

Though you have not mentioned your age but it seems you are from the era when there was no youtube or even the internet. I say what a time to be alive now . We can 'self teach' anything that we always wanted to learn and be good at. All the best

Dear glad2teach thank you for making math what it truly is...FUN! I showed my son your vids and he got a kick out of them his 2nd grade teacher was amazed at his ability to multiply so quickly and accurately! I hope you continue to teach us all!

Dear lllunatix , the Base Method remains the same even if the number is above 19 ( that is in 20s ). However for ease of calculation, it is recommended you use Base20. To learn how to use Base20 pls watch the 3rd EasyCal Video on glad2teach website (link is given below this video )

I am proud to see someone from my motherland speak up on RU-vid. I am going to college to be an engineer and I'd love to learn all my math from you.

Dear Logan, Mathematics is called Math in USA, Canada and Maths in UK, Asia and Australia. I teach Mathematics around the globe ( being an online Math teacher) thus I can state that fact with confidence. Best Wishes Shahryar Badar Khan (Glad2teach)

Dear VYD239, glad that you found my Easycal Video useful. Being a teacher I politely corrected kklive305. I never intended to belittle him. People have really liked my comeback at him ( 84 Thumbs Up and counting ... )

@Kentukijs , Only if you want to order the Full EasyCal Series ( 30 EasyCal Videos of Fast Math Tricks and 26 Fast Algebra Tricks) you have to pay US$ 48 to get a license for lifetime. An investment worth making for a bright academic future of you and your children. Otherwise the EasyCal videos on youtube are Free . Even the Online Seminar which I am conducting " How to become a Human Calculator ?" is absolutely FREE to attend and participate. So many people have already registered for it.

Dear Cosmicsprint, till 220 you were right. Now you need to add to it the product of Distances. Your Question: 20 times 12 = ? Using Base Method (though directly multiplying with 20 is also easy ) 20 is at the distance 10 from Base10 & 12 is at distance 2 So ( in the cross manner ) add 2 to 20 to get 22_ or 220 Now just add to 220 the product of distances ( 10 x 2 ) That is 20 So 220 + 20 = 240 (ANSWER) PS: Always remember that it is the distance from Base you need to use

@TheRicoFrico, thanks for calling me Brilliant. Ofcourse you can use any multiple of 10 as a Base ( like 20, 30 ...50 etc ). Do see the 3rd video on Glad2teach website ( link below the video above ) .. Shahryar Badar Khan ( Glad2teach )

My friend I liked the polite way in which you have worded your question. I am at your service. 17 times 18 = ?, Add the distance 7 to 18, to get 25_ or 250. Now just multiply these distance of both the number and add to 250. So 7 times 8 = 56. Final Answer is 250 + 56 = 306 Shahryar Badar Khan (Glad2teach)

This is great stuff. Nothing is hard, it's only how you are taught. You are a good teacher.

It's times like this that I shudder to contemplate the modern ability to use one's brain, but I am glad things like this are trying their best to combat the flow

I've went through Calculus and Algebra 3 in college... always with straight A's in math, and I very much enjoy this new method of mental math, thank you Glad2Teach! I subbed!

Dear ClassyCoconut, most of us are already Math Geniuses who have "deceived" themselves in believing we are not. In fact human brain does complex calculations all the time. When you 'cross a busy road' your brain calculates in seconds the speed and acceleration of the oncoming vehicles. When you 'catch' your brain calculates the angular velocity of the moving ball in air. Thus when I say that every human brain (yours too) has a calculator hidden inside it, I am not trying to flatter.

I'm in Mathcounts and I really needed to know this. I thank you for your great videos on math. Keep them going please!

Dear Ascaithe , thanks for posting a well worded comment. You have managed to describe and diagnose the problem correctly.

@oomskaap Remembering the base as 10, so 20 is +10 from that. therefore, for solving 15x20: add 10 to 15 to get 25. Now we need the last digit, so we multiply the two "ends" 5x10 = 50 since we only have one digit left, 0 is the digit we use and 5 is the reminder to be added to the second digit. So we have the digits [2] [5+5] [0] = [2] [10] [0] which caries over to" [3] [0] [0] So the answer is 300.

hey that was actually worth watching. this is a really big help thank you for teaching ! keep teaching and learning because the world needs it.

Oh. My. God.!!! This is absolutely brilliant.!!! I've been having trouble multiplying in a good amount of time for years and this method is absolutely amazing.!!! Thank you so much.!!! I cant thank you enough.!

I'm pretty sure this was one of the first videos I ever watched on RU-vid. It's hard to believe it's been more than six years now.

Dear crabag , glad that my video could help you.

Thanks !! It is not an isolated trick but a proper technique (part of the complete Base System). To learn this concept of Base watch the 3rd demo video on glad2teach website (link given below the vid above). Shahryar Badar Khan (Glad2teach)

Ayushpareek , thanks for the respect you have given me. You being from India yourself know it well, Math Geniuses can be found in every nook and corner of India. The uneducated vegetable vendor in India or fruit seller on the roadside does complex mental Math with high speed and accuracy. We do not even consider it a 'big deal' as we have been seeing it since childhood. I have never seen them use a calculator no matter how many items ( in whichever quantity ) you buy from them.

I found this out myself when I was 6, I showed it to my brother all proud and he said this method already existed.

Thank you! i have a maths exam later today and have stayed up all night to revise for the exam and may i just say your method really works and i found this really helpful and will use it more often now i know it :) i have had a go on paper with this method and it makes more sense to me the way you have showed me. So again thank you! and keep it up with these very useful math tricks :)

it works for any two numbers. For your example, 33 X 15 = (10+23) X (10+5) so then the formula gives the answer as (33+5) X 10 + (23 X 5) = 495 As you can see, it is harder when the two numbers are not close to 10, but it still works

God bless ya dude, i love your tricks

Guineapiggyman, thanks for appreciating. Teaching Mathematics is indeed my profession, learning Mathematics is my passion and creating new Algorithms for faster mental Math is my source of entertainment. I only go out shopping so that I get to add my shopping bills. Even while driving, I cannot stop myself from adding or multiplying together the number plates of cars moving in front. I accidently swiched on the calculator in my mind. The problem is I do not know how to switch it off :)

Chirleylove, I always tell my students that a Technique is like a tool in your hand. Efficiency of a tool also depends on the skill of the person using it. A tool does not have a mind of its own. But you do. You want Base10 to work above Base20. It does. Like 22 x 21 = ? Distance of these no. from Base10 is 12 and 11 . So add 11 to 22 (or 12 to 21) We get 33_ or 330 . Now add to it 11 x 12 = 132 . So 330 + 132 = 462 (Ans) See 3rd EasyCal Vid on Glad2teach website (using Base 20)

I owe a lot to Mathematics. Being a Math teacher I earn my livelihood by teaching Math and creating video tutorials on it. I am deeply in love with Math just like some people love their bike and car (even I do :) Whatever respect I have earned is because of my Math Ability. Do you know the best part. Math does not come naturally to me. At school I always scored higher marks in languages than in Math. Thus when I teach Math I am aware where a student would get stuck. Shahryar (Glad2teach)

This works like magic! Thank you so much for sharing with us

SCARY! I tried this on my 6 year old, using a multiplication chart, and I was blown away! Much props to you.

Limitation of this technique (Base Multiplication) is not what you have mentioned ( both numbers beginning with 1 ). It is the distance from Base that matters. So you can also multiply 23 x 21 using the same technqiues (Base10) by taking distance from base10 of these numbers as +13 and +11. I recommend using Base20 to easily mutiply numbers in 20s. The 3rd Easycal video on Glad2teach website ( link is given below the video above ) explains how to use Base20. Shahryar (Glad2teach)

This is great. I was looking at this and tried to figure out your fast method before you showed us and was able to get a method that's different than what you showed. 13 x 12, I know it's more than 100, so i put down 100, then I multiplied 3 by 10, then 2 by 10, giving me 30+20. Next, 3 x 2, giving me 6. 100 + 50 + 6 = 156. That just makes sense to me, though it's one or two more steps than your fast method.

@monstermashsmb3 Canada; Math 200 is second year standard mathematics in university, known as multivariable calculus (integration and differentiaion in > 2 dimensions).

one of the best that i ever saw! i'm doing engineering and that's very helpful while doing counts like that!

I've learned more from you teaching in English than from my teacher teaching me in my maternal language.

Thankyou so much..I'm 26 and this is the best thing that's happened to me since Playstation,now I see why .

Dear skingoogles, more than anything else, being good at Mathematics is about having 'interest and confidence' in this subject. You know it well, how easy it is to kill them both in the early childhood itself. Thus I really love it when people share such personal stories of progess and improvement. My best Wishes to your bright Son -- Shahryar ( Glad2teach )

wow, great tehnique ! i've always had problems with slow multiplying, and this is awsome

yes, this is what I found out also, only in a different manner. thank you for sharing.

It is strange but many of my students from different countries have told me this exact same thing. When they calculate mentally they think in my accent. I guess our mind has a natural propensity to remember peculiar things better !! Shahryar Badar Khan (Glad2teach)

I am glad that i have learning math tricks from a noble mathematician from my motherland

I have three questions for you! 1.Do you find these methods yourself? 2.What is your name? 3.Would you be able to make videos about methods to work out big equations like quadratic expressions, angles etc? By the way, this is my first comment on my new RU-vid account!

ik its great when you have people appreciating your work x] Well Done !

I love the way that you teach!

I was wondering how did you find out this trick. The questions were nicely done.

I'm terrible with math, always have been and I'm 53. I can't even balance a check book. This way of multiplying I'm kinda getting into. It's a little confusing at first but I'm picking it up. I think I need to watch this video a couple more times. I would SO love to understand mathematics for the first time in my life. I'm gonna watch all the videos.

During a maths lesson my teacher gave me a really hard equation to solve in front of the class. "Come along Watkins!" he boomed "What's the answer?" "I'm not sure" I replied nervously "What do you think?" "I don't 'THINK', Watkins. I 'KNOW" he said back sarcastically. "I don't think I know either Sir"

oh, you don't know how such a great help you are! thank you very much for sharing all these :)

@OKardboardKyleO it does work for 13x15=195. You have to carry the 1 over the 8.

@asleeperj Gets a bit tricky there. First off, to get the first numbers you do 9*4 = 36_ _ . Then do the middle 2 spaces (6 and _) which is (9*3) + (4*6) = 51 so add that to it to get 411_ then for the last two, do 6*3 = 18 so you have 4128!!

literally you have helped me so much with math your amazing ! please make more videos !

Mathematics is Math in USA and Canada , while it is Maths is UK and India. I have taught students from these countries thus I know for sure.

Of course you can !! 15 x 14 = ? 15 + 4 = 19 _ ( one empty place as Base10 has one zero ). Thus 19_ is nothing but 190 Now just add to it the product of distances ( 5 times 4 is 20 ) So final Answer is 190 + 20 = 210 You can easily answer that mentally

thanks for showing me how exciting Vedic Mathematics is.

I have an ABI, this is going to be incredibly helpful, whne I forget to bring mycalculator to college, thank you so very much from the bottom of my heart. NAMASTE!!!!!!!

Again you taught me only in 5 minutes! Would be glad, if my math teacher would be such that fast. She always uses the longest ways you can take, but paradoxically she says mathmaticians would be lazy in math.

You have a very brilliant technique, this is a wonderful trick to remember when one does not have a calculator. Thanks man! :)

there is also another way using distributive property like this since it is easier to multiply numbers that end with zero this helps out 58x23 you turn 58 into 60 then multiply 60 and 23 which is 1380 and then since 58+2=60 you multiply 2 to 23 making 46 which you than subtract from 1380 making 1334 yours is easier but this way applies to numbers close to 20 30 40 600 7000 etc but thank you for this

I think, your classes are a boon to the students who are weak in Maths. Congrats and good wishes for having a mind to share your intelligence with others. Definitely, children will start loving Maths. Also, your voice is very friendly.

you get mine for sure !!

Who would dislike something as helpful as this?? Haters.smh

To: @glad2teach Thank you very much your the best

THe way I do 18x16 is simple but you first should know any number times 15 is the number + 1/2 then add a 0, it sounds hard but its simple. 18x15 = 18 + 1/2 of 18 is 9 or 270. Since 18x16 is one more unit of 18 its 270+18 or 288. This sounds tricky but with practice it becomes second nature. 25x16= 375 + 25 or 390, 34x16= 510+34 or 544. 42x16=630+42 or 472. You just have to add 1/2 the number to the original when your multiplying by 15 and add a 0 sinc 15= 30/2 or 3/2 + 0 3/2=1.5 =x + 1/2x

Like seriously, I am super glad my sister told me about your channel

Great job nice to see a teacher takes the extra step and teach others . You helped me a lot in school . However you need to make more vids please :-)

Brilliant, brilliant, brilliant, is all I can say. I thank you very much!

@glad2teach I had to take a long drive one day. to pass the time I figured a similar way to do 3 digit numbers in my head. When I got home, I was so excited. I made my wife sit with a calculator and try it with me. She got SOO bored, but I still think it's awesome.

This is awesome! for this kind of videos should be youtube. Thanks for sharing... all schools around the world should have teachers like you. Greetings and respects from Argentina!

when you showed the 13*13 it was fairly simple because in grade 8 all students would have had to learn the squares up to 20

13x12=(10+3)(10+2)=10(10+3+2)+2x3=10x15+6 and thats how we get this trick. glad2teach thanks for sharing knowledge.

Sir aapne to meri zindagi hi badal di!!!

You used Base20 instead of 10 ( 25 is at the distance of 5 from Base20, not from Base10). That is where you went wrong. Rest was fine. To learn how to properly use Base20, watch the 3rd video posted on my glad2teach website (link is given below the video above ) Shahryar (Glad2teach)

I found 13 x 12 in less than one second. 12 x 12 = 144, + 12 = 156. As easy as it can possibly get.

Teachers need to be more like you.