Take any three digit number in which the first and last number differ by more than one i.e. 335 would be O.K. but not 333, or 332.
Reverse this number
Subtract the smaller number from the larger.
Add this answer to the same number reversed and the answer is ALWAYS 1089.
Example 1:-
335 Reversed = 533
533 - 335 = 198
198 + 891(198 reversed) = 1089
Example 2:
932 reversed = 239
932 - 239 = 693
693 +396 = 1089
All thes tricks has been taken from:
http://www.hintsandthings.co.uk/games/numbers.htm
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