Hello friends, @kamchore here with an other mathemagic post. Hopefully you will be doing fine in your quarantine time. My friends if you missed my previous mathematics tricks you may click on the below mentioned links.

Mathemagic

Mathematics Skill

It's time to share an other trick. Do you know which is the most powerful and unique number. Zero, Yes zero is a powerful number but there is another number which is more powerful than zero. The number is 9.

credit

Check out the multiples of 9

9 x 1 = 09

9 x 2 = 18

9 x 3 = 27

9 x 4 = 36

....45,54,63,72,81,90,99,108......999,.......1800

Check out these answer every time you sumup these answer you will get nine

18 = 8 + 1 = 9

999 = 9 + 9 + 9 =27 = 2+7 =9

Amazing isn't it

Let me share an other trick. If you want to know that any number is multiple of nine it's simple. How Let assume a number

- It is difficult to divide the number to find out that either this number is the multiple of 9 or not. Here comes the simple way to check.
- Add all the digist i.e

4 + 5 + 6 + 3 = 18.

18 is the multiple of 9 so this means 4563 is the multiple of 9. Do you know the reason why I add these number. Let me explain

4563 means four thousand five hundred and sixty three. We can write this as

4 x 1000 + 5 x 1000 + 6 x 10 + 3 x 1

4 (999+1) + 5 (99 + 1) + 6(9 +1) + 3

999, 99, 9 is the multiple of 9 so neglect these number and add remaining number

4 (1) + 5(1) + 6(1) +3 =18 = 1+8 = 9

Hopefully you will easily find the reason behind the trick. Wish you a very happy and healthy life ahead. Have a nice time