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= Math Trick =
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Please enter a positive integer: 123

The sum of the digits in 123 <=> 6

The sum (6) subtracted from 123 <=> 117

Please enter 117 with the digits re-arranged: 171

25 addeded to 171 <=> 196

Please enter 196 with a non-zero digit removed: 16

The sum of the digits in 16 <=> 7

7 subtracted from 7 <=> 0

0 subtracted from the next highest multiple of 9 <=> 0

     Congratulations! Your final Math Trick result is '0'