LUCKY 9

Think any number. Say 123456
Reverse the Order of the Digits. Gives us 654321
Subtract the Lesser from the Greater Number. 654 321 - 123 456 = 530 865
Now, add up the sum of the digits in the remainder. 5 + 3 + 0 + 8 + 6 + 5 = 9.

Try other numbers.

You will find out that no matter what number you choose,
THE ANSWER WILL ALWAYS BE 9!