Fast Maths Trick of Calculation

[@CuriousObserver]

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!

[@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)

[@glad2teach]

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

[@azetweh]

Pasti kesini gara gara Akbar Hakim

[@glad2teach]

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

[@Bcutter]

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

[@maxswe4ever]

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.

[@WTFWasThat]

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

[@bg76183]

Hahaha

[@hxrleyaf2]

You stole that

[@glad2teach]

@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)

[@davitsk1]

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

[@punamthakur7736]

thanks, it works. :D

[@nagasrinudasari5369]

of course it's easy for smaller values not for bigger... ;)

[@Youtubewatcher-111]

WOW!!! it works man...Great!!! thanks!!!

[@GEEOHVAILEA]

Nagasrinu Dasari I so agree with you

[@kamrulzoha9223]

i also do this .. and v simple for me...

[@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.

[@lnewlf5664]

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.

[@monikarawat9583]

Cool

[@alla9498]

I am not Maitri, but using his/her method: 1*8 = 8 for the first digit; 8*0 = 0 for the last digit; 8*1 = 8 && 8*8 = 64 => 8+6 = 14 for first 2 numbers; and we have 4 left from 64 and 0 for the last digit => 1440

[@AD-wg8ik]

That does work if the second digit multiplies

[@lnewlf5664]

@@AD-wg8ik god I forgot about my own trick! Now when you replied, I checked my comment from 3 years ago, now I know this trick again lol thanks a lot 😁😊

[@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)

[@mbrightmusic]

You sir have a new subscriber

[@ChevyVanDude]

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?

[@rajendrasaw534]

Not working after 20 table

[@zerevity007]

it said closer to base 10

[@tiotito31]

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.

[@sonujaggumantri0292]

trouble shots at 14×14

[@asankamallikarachchi2762]

adcus

[@navrajsinghgill2733]

Tera ans:196 haa

[@glad2teach]

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)

[@kesha43589]

Not 5 minutes 5 minutes and 1 second.

[@MannyVF84]

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!

[@rojas395]

This is like so cooooooooooooooooooooooollllll!!!!!!

[@elonmusk8102]

ur comment is tooooooooooooooooooooooo old

[@Giga_Pudding]

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

[@downoteof]

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

[@FrostByte_AC]

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

[@glad2teach]

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

[@glad2teach]

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

[@glad2teach]

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)

[@glad2teach]

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)

[@glad2teach]

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.

[@SuperSwontonBomb]

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 :)

[@glad2teach]

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 )

[@glad2teach]

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

[@glad2teach]

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 :)

[@justdavid1122]

Using this method I tried 34x34 and above up to 39x39 but it seemed hard. Can I have a bit of help..please..

[@devasiacp2424]

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.

[@bruceweel]

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

[@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.

[@shirin8402]

Come in some time, it gonna be 4 million soon!:))

[@Renegade655]

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!

[@NurseAriRN]

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.!

[@glad2teach]

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)

[@NoobyIntellect]

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

[@glad2teach]

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)

[@NS2Las]

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

[@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.

[@wcald]

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.

[@glad2teach]

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)

[@glad2teach]

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)

[@salsabeel2306]

Same to me bro

[@Quarantine7]

@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.

[@genevieveluana3816]

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

[@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 ... )

[@cocopopsiz5818]

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

[@AlbinJi]

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 KZbin account!

[@tocobern]

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

[@bunty6489]

It's awsome i was vry much weak in maths but i found the root now....... Thank you very much sir.... For uploading this kind of videos...... Though i spend my time on net...... I can read well..... Thanks a lot.......... Chao!

[@MrMike0113]

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

[@agostinho1234]

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

[@KeiShifu]

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

[@porklik]

@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!!

[@XCaldamanX]

May I say also that your math skills and remarkable and it is no wonder you had a high score in languages in school you English is very good :).

[@9308323]

you can also get 13 x 13 by multiplying 10 and 16 (13±3) which will give us 160 and add the square of 3 which is 169. This is quite complicated at first but comes very handy especially squaring 3-digit numbers. You can also do this to any numbers you want to SQUARE. Anyways, mental math is all about common sense which this video has. Cheers for the very helpful tutorials.

[@glad2teach]

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)

[@liquidminds]

with multiplications close to 10, i still think it's easier because closer to intuition to split the multiplication to 10 + x. f.e. 12x13 = 12x10 + 12x3 both multiplications are easier to solve in your mind.

[@cohenramin]

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

[@Hannahlynn12]

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

[@user-bq8ih9ih3b]

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

[@glad2teach]

ProFootballX thanks for the kind encouragement. I would humbly prefer to be called a "recycler" of knowledge. My work is based on 3000 year old Fast Math System from India. Not many people know that our Counting was designed in India. It is known as Decimal Place Value System ( Decimal itself means Base of 10 ). That is why our counting repeats itself after every 10. A student can crack the DaVinci Code of Math once he understands how to use this power of 10 Shahryar (Glad2teach)

[@glad2teach]

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

[@RedAngryBadger]

I will agree this is a very fast way but for some reason I prefer the method I've been doing for a long time which is: 13x10+13x2 and using the method I use makes it easier to do mathmatical equations like 4356x15, you just break it down to: 4356x10=43,560 then basically do: 43,560 divided by 2= 21,780 then put them together to get 65,340, it may not seem easier but it is to me :D

[@diffchoice11]

65*65 --> add 5 to 65 --> 70 (Multiply by 6 as it is base 60) = 420- one more to go 5*5 = 25 so answer is 4225 So I guess the answer is to the first part multiply by 6 is the key here. Thanks I am impressed !

[@szqsk8]

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.

[@glad2teach]

Dear crabag , glad that my video could help you.

[@MrSmartmove4ever]

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

[@csumityaday]

Thank you for posting this..this trick will be helpful in my competitive exams.

[@Garwesvinu9e]

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

[@MrHyburn]

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!!!!!!!

[@sizzbby]

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

[@Atomchild]

@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.

[@youtubian2500]

Oh these methods you have are brilliant, and very simplistic. I used that method at a presentation where I was faced with the question "Well, if the payout is 154kr a piece after tax and they get 90 pieces per box, how much would we profit per box?" Quick on my feet I remembered this and did the simple calculation in my head (16400-540) and quickly answered "13860kr", now I look like some sort of genius. Feels like cheating.... :)

[@actingboi815]

Great video! Sure it will help on my maths! Is there a way to calculate algebra in a more faster way?

[@TheAsem1992]

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 :-)

[@sasha216t]

its only for numbers close to ten. 76 isn't supposed to work in this method, but there are methods made for numbers in that range

[@SerbianJudo]

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

[@genevieveluana3816]

Well I think your accent is very clear and you speak with excellent English! Awesome help.

[@livedandletdie]

This is a simpler way to calculate this. But I've always found it easier to use my way which is multiplying the last number with 10 then adding the last number times the leftover from the last multiplication and it works infinitely with how high numbers I want. Let's see 156*526=82056. first multiplying 100*526 then 50*526 then adding 6*526 where the last one is 3156. the second last one is 26300. and the last one is 52600.

[@NWOBHMhead]

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.

[@uditawasthi]

hiiii superb tutorial i was actually weak in maths ur tutorial help me alot thanx

[@geren11]

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

[@NattyDread91]

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

[@10sameeeer]

all the positive adjectives of the english language will fall short if we try to appreciate the great work taken up by the team at the KHAN ACADEMY and especially its founder SAL. Thanks a lot for this endeavour and please keep up all the good work,wish u a great success ahead...

[@PaulineLovesPhysics]

in 134 for ex. 3 is not 3, its 30, the 1 is 100, and 4 is just a 4 sense its in the ones place. EX. 34x12 30x10=300 30x2=60 (add 300 and 60 to get 360) 4x10=40 (360+40=400) 4x2=8 (400+8=408) OR 34x10=340 2x30=60 (340+60=400) 2x4=8 (400+8=408)

[@Julumkana]

i think i have a simpler way to do this. 12 x 13 . Multiply 2 and 3 is 6, add 2 and 3 is 5, multiply 1 and 1 is 1. = 156. 14 x 14 muliply 4 and 4 is 16 . 4 plus 4 is 8, 1 times 1 is 1. Then you put them together 16 8 1 add them 196 only works with 10's

[@MarianoDevourment]

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!

[@168nataliya]

I like that method :-) , but for me the easier way to multiply two-digit numbers by using the distributive property 18x14=(18x10+18x4=180+72)=252 (mental count there) , but anyway, it dependents from practice / skills

[@zzdiaozz]

I always use this method with numbers thathave base 10. Example : 14x12=? 12= 10 + 2, correct? so you take 14 x 10 = 140. Then you take 14 x 2 = 28. den u add up both answer, 168.

[@hobonicole64]

YO THIS IS AWESOPME YOU ARE A GENIUS THIS IS SO HELPFUL THANK YOU SO MUCH

[@thesweetarab911]

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

[@glad2teach]

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 )

[@prinsipearturo]

@RICHARDBENIT0 just multiply the first digit in 50 thats 5 and then the 7, so 5 x 7 =35_ then u add zero, thats 350. but this only applies in 2 or more digit numbers which ends in zero multiplied to a one digit number, 40 x 4 = 160. because 4x4=16 then u add 0, u got 160. 110x 3=330.

[@pistoe]

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

[@ayushpareek265]

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

[@glad2teach]

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 )