Magic and numbers

Magic number 9

When God invented the number 9, he decided to have some fun.

For any number multiplied by 9, He made the sum of the digits of the answer to equal 9.

For example:

6 times 9 equals 54,
5 + 4 = 9

628 times 9 equals 5,652
5+6+5+2=18
1+8=9

Et cetera

This doesn't happen with any of the other nine digits from 0 to eight

 
More magic number 9

When you mix up two digits in any number, the sum of the digits of the difference between the number and the mixed up number always equals nine.

For example, mix up the digits in the number 456

Say 645

The difference between 456 and 645 is 189.

1 + 8 + 9 = 18,
1 + 8 = 9


This doesn't happen with any of the other nine digits from 0 to eight

81 divided by 80

Have you ever divided 80 by 81?

I did, and I found to my surprise that the result is:

.987654320987654320...

Hmm... I looked again and I saw there wasn't a 1!

Where is the one?

It is there.

If you try to round off the number, you will end up with .987654321


Do you know of any magic numbers? If you would like to share them, please send them to us at magic@themadadder.com