But why is it and how is it that if we multiply any number with the number 9...

Then add up the individual numbers...

We will end up with the number 9 every time...

Number 9 is the only number that works out this way...

Any amount of 9's can be used and the results will always be the same...

Heres a few examples of what I mean...

9 x 9 = 81 and 8 + 1 = 9

17 x 9 = 153 and 1 + 5 + 3 = 9

852 x 99 = 84,348 and 8 + 4 + 3 + 4 + 8 = 27 and 2 + 7 = 9

Whats mathematically going on?

Why only number 9?

Is 9 a magical number?