Cool Maths Trick

An awesome maths trick for multiplying big numbers and an explanation as to why it works. Although this "trick" is actually a legitimate method for multiplying many numbers, proven algebraically, it's probably best not to rely on this in an exam, for example.

If you're not interested in Maths, do not watch this video because you will find it boring. Don't complain that I've wasted your time if you have chosen to watch it.

Category:

Science & Technology

Tags:

• maths
• science
• trick
• algebra
• multiply
• explanation
• why
• cool
• fun
• math
• mathematics

[Spiker985]

MATH MAN MATH NOT MATHS MATH!!!!!!!!!

[jaketvee]

@Spiker985 "Math" is an americanism, it's "Maths" in English.

[LokizarroX]

no offence man, but who the fuck wants a math lesson on youtube?

[jaketvee]

@LokizarroX People who like maths. :)

[jordancooktech]

I could of sworn jaketvee was a Technology channel....

[solracord]

@jaketvee I like maths. :)

[SmilingGivesHope]

HI5

[Hijinz]

What I tend to do when it's high numbers, I take the closest number to a factor of 10,

lets say here 85 x 98, just like in your exemple, 98 is the closest to 100.

So 85 x 100 which equals 8500,

then you multiply 85 x 2 = 170 (Because you made 98 2 times bigger than it actually was before)

Take 8500 - 170 = 8330 and voila! It's just a trick for fast mental calculation.

[jull23]

your deduction is funny at the end lol,( x * y = xy) duh! lol

[animelovergal2002]

Okay... My head hurts, after watching 8 min of this.

Cool trick throu

[jo17171717171717]

@francislawton very true

[jo17171717171717]

stop wasting your time on multiplications, you'll never need to do that in your career

instead, try to make your method more sound by proving it with mathematical induction, or try to improve your skills on knowledge your WILL need, like integration or derivatives.

Cheers!

[HiMyNameIzLee]

I just got confused and stopped watching but...I'm a tool!:P