Mathematical Solutions: Multiplying Big Numbers

If you are the type of person who has little interest in numbers and would rather draw doodles in your test papers than solve, I know what your feeling. I wish my passion for puzzles equates my skills in numbers, but my brain tends to fly to a completely different world when I start seeing digits.

Big numbers are the scariest, aren't they? I dread the days when the teachers would hand out exam papers and strictly implement the rule: NO CALCULATORS. How am I supposed to calculate these three-digit numbers in half an hour? All twenty sets of them?!

Today, I found out what I should have found out when I was still in school. If you're still studying and struggling in Math, you're lucky to have stumbled upon this article.

This day is the day when you find magic in Mathematics, all thanks to the creative minds of Japanese people. All you need to do to be amazed is click the play button below.

Nuff said. This is truly an art of Mathematics. I'm not taking Math exams anymore, but I could still use this  when I'm kidnapped by mathematical terrorists and I end up becoming one of them because I am capable of multiplying BIG numbers.

Mathematical Solutions: Multiplying by 9

We've always wanted a faster way to solve math problems. That's why we always have our handy dandy calculator. But what if you don't? You wouldn't be always carrying your calculating device everywhere, would you?

If you want to answer math problems in a snap, here's a useful math shortcut that you might wanna try before you become too dependent on calculators.. (To the point that you'd actually type 1 + 1 when the answer is already obvious).


Multiplying a number by 9.

169 X 9 is equal to? Something. You stare at the numbers with annoyance. But seriously, try and calculate it by yourself. You can write it down on a paper or mentally solve it. NO CALCULATORS!

Done? Okay. Here's the trick. You can actually solve this by using the number 10. How?
Watch:

169 X 10 = 1690
1690 - 169 = 1521

Try checking if it has the same answer as 169 x 9. It's the same, isn't it? So how did it happen?

Remember that 10 - 1 is 9.
So, basically: 169 x 9 == 169 x (10 - 1)
And we all know dividing any number to 10 is easy.

Well, it's faster if you like subtraction and subtraction is much easier than multiplication, right?


There'll be more Mathematical Solutions so stay tuned :3