Speed Math: Amazingly fast!!

[thevirus2925]

i think to do multiplication like we learned much better, u confused the whole population girl lol

[difficultsyllables]

13 x 12 Add the last digit in 12 (which is 2) to 13 So 13 + 2 = 15 Then multiply the last digit of each, 3 x 2 = 6 then put that behind the 15 to get 156. If it's 14 x 16 Add 6 to 14 to get 20 4 x 6 = 24 Carry the 2 over the 0 and you get 224 ^That's about 100 times easier, and it works with a lot more numbers than just 12. You're welcome.

[emiliejohansson1]

or just use a calculator

[mgk12341]

sounds like Baljid from phineas and ferb!

[rohitnagrare89]

easier way is place 1st & last digit same in there respective position i.e 1__3 then add 2+1=3 & 2+3=5 thus d answer is 1353

[MrJSTinnin]

PJKonsultan has a point, very good on showing the math too! TonyC1029's version is much better, his method comes up w/ the correct answer to the 758 * 11 problem also.

[PJKonsultan]

how about 758 * 11 ?

0 7 5 8

8 + 0 = 8

5 + 8 = 13

7 + 5 = 12

0 + 7 = 7

write it, becomes, 712138... wow.... but the correct answer is 8338... how to explain it, sweetheart?

Thumb up if you feel my opinion is right...

[Michel0555]

@PJKonsultan

Obviously 7,12,13,8 would be rewritten to become 8338 because we are using the decimal system.

[taolahuy1681993]

@PJKonsultan Thats amazing speed math

you have some mistakes

0 7 5 8

8+0=8

5+8= 3 (remember 1)

7+5+1 = 3 (remember 1)

0+7+1=8

then 8338. Hey guy, try to but your phone number times 11 and do it in few seconds, trust me!

[zombiejuice4u]

This is not speed math. When multiplying 2 digit numbers together such as 12x13 its easier to multiply 13x10 then multiply the 13x2. She makes it too complicated.

[macog5]

damn i was actually watching weed video... and then I got here... WTFFFF!!

[iateyourgranny]

Narrator: *throws away calculator*

Question: Find ln(2)

Narrator: oh shit

Really, do you expect people to remember one process to deal with EACH type of multiplication/division? Btw, your two methods (for multiplying by 11 and by 12) are no different from the traditional way.

[lbrewer42]

Tricks like this are fine, but unless you teach a student the logical reason WHY this method works, it has potential to become later-forgotten & useless.

This also will disprove that only "smart people" can "do math." This faslehood is caused b/c some students (seen as "smart") are more adept at figuring out the logic themselves while the students who need more help with UNDERSTANDING (not copying formulas) are left out in the cold.

From a 20 year math teacher

[9308323]

@lbrewer42 Really now, I find it amusing that teachers really do think they're smarter than students just because of they're teachers. No offense to you sir, but the reason WHY this method works is obvious to begin with. The trick like this is BARELY any different from the normal method of multiplying by 11. Think of it as something like this:

125461x11=125461x(10 + 1)

1254610

+125461

1380071

You just basically add the same numbers and just realigning them. Coming from a 10 yo kid.

[Michel0555]

@9308323

I agree, the method from the video makes it seem more complicated than it really is.

[BrianJacksonBJ]

i like it cos when im in class im the only one who did the test good im very proud of my self im so happy!!!

[citroenfav]

what happens if their is a ten

[tempestblade123]

.-. this is just weird. An easier method for 11 is: multiply bzy ten and add 1. How hard could it be

[9308323]

@tempestblade123 This method is just the same as that, just try to do this from left to right instead of right to left. I find it so weird that people keep teaching to do math from right to left instead of the other way around. Right to left method forces your brain to maintain memory of the WHOLE problem. While the Left to right method allows you to say a part of the answer while still calculating the remaining parts which greatly reduces chances of mistakes.

[Keyarchan]

@9308323 Uhm, I think I could be misunderstanding what you're saying, but going right to left ALWAYS gives you a part of the answer(the last digit) and also keeps you updated on any extra numbers that needs to be added to the next calculation of the problem(if the digits in the number are large), while if you go from left to right every single digit in the number can change(again, if large digits).

[9308323]

@Keyarchan That's what people think at first. Yes, the digits can change anytime,but a huge portion of the mental math tricks won't give you any advantage if done from right to left including this one. However, doing this tricks in a 10 digit number ALWAYS require around 50% more memory if done from right to left. In other words, there's a big chance for you to confuse your number with something else(human mind can hold 8 digits at default)while trying to solve thus is less efficient.

[9308323]

@Keyarchan Doing this in the Left to Right method frees up a big portion of memory once you called out the definite portion of your number. After all, you read numbers from left to right, you pronounce numbers from left to right, and so it’s just more natural to think about (and calculate) numbers from left to right. Also, if you want to estimate your answer, it’s more important to know that your answer is “a little over 1200” than to know that your answer “ends in 8.”

[OhWowLovelyXx0]

Wait. So you put a zero for double dight numbers?!

[idolkritiq]

Speed Match = CALCULATOR ; any other way is pure ignorance!

[RizwanAhmed2011]

Easier Way Under 10

13 x 12

1: Add 2 To 1st term value i.e 13+2 = 15

2: Multiply 1st term's 2nd digits to 2nd term's 2nd i.e 3 x 2 = 6

answer : 156 :D

Solution:

13 x 12 = 2 + 13 = 15 & 3 x 6 = 6 = 156 Got It.. !!! :D

[KocirovD]

@RizwanAhmed2011 What about 11x11 ?

[werewolf3335]

thanx you helped a lot

[LeXtemeFreak]

my calculator is faster!

[Seanze329]

@LeXtemeFreak But it doesn't make you any smarter.

[imupnorth55]

Does the 'SpeedMath' only work with multiplication? And is there other 'shortcuts' for such subjects areas like Calculus, Algebra or geometry?

Anyway, thanks for the video upload, this is really intresting, and I will when the time is right teach my daughter these skills.

[schulerplima]

this is bullshit

[TheRosangela1987]

Very well! It works with 14, 15, 16, too. It's really interesting!

[dcallaghan89]

artofspeedmath(dot)com

free speed math training program!

[motermuis1961]

you can better do by 123x11= you take the first number: 1 then the first and the second: 3 then the second and the third: 5 then the third: 3 answer 1353

and by 13x12 you can better do this: firts you do 1x1=1 thats your first digit then leave a blanc space: 1_ then do 3x2=6 thats you 3 digit now you have: 1_6 then you do 3x1+1x2=5 and put that on your blac space now you have your answer 156

[akwah2002]

amazingly stupid !!!

[zirol1]

whaaat theee fuuuck is this shit,she can't explain

[2226416]

Wow this is terrible.

[cirajjaric]

this is so stupid. There are way quicker ways of multiplying and by ANY NUMBER.

[leshy69]

I am now dumber for watching this. how the hell can you complicate 13x12???she did though

[GetItRight222]

This is a slow shitty video and that lady's accent is very annoying. I think calculator is much faster than what she's teaching. I would never use that dumb technique.

[Rethardus]

@GetItRight222

I don't need a calculator for 13x12. And I don't need her tricks either.

[SophistAtheist]

this is dumb....

[barnacora]

AMAZINGLY SLOW!! simply a trash....killed my valuabale time...this posting should be removed...

[SophistAtheist]

agree, this bitch shouldn't be allowed to speak

[TonyC1029]

easier way is 123 *10 = 1230, then add 123, you get 1353, and you can do it in a second.

[SophistAtheist]

agree

[AJasinski3]

@TonyC1029 that is easier for when the second number is 11. but of course thats not always the case. this shows how to do it even if the other number was 14 or 15 etc.

[lponced2002]

@TonyC1029 uh. sorry but with practice the 11 method works even faster. Also, with larger multiplications, you can basically mindlessly calculate with the "11 rule" when needed, instead of adding upon adding.

[ankin8]

dude they taught us this in 2nd grade.

[Jupiterx5]

A lot of schools didn't.

[sunnyatscot]

i dont get it

[DansherHenry]

oh...