### Number 1089

On a sheet of paper write a three-digit number,

where all the digits MUST be different.

Reverse the order of the three-digits

in the number from last to first.

Subtract the smaller number from the larger number.

If the resulting number is a two-digit number, it will be 99.

Place a zero in front of the two-digit number (99) to make it 3 digits.

If the result is already a three-digit number, just continue.

Again reverse the order of the three-digits in this new number from last to first.

Now add both of these new three-digit numbers together.

The result will be always be 1,089. Why?

523 - 325 = 198 + 891 = 1,089

817 - 718 = 099 + 990 = 1,089

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