Another trick: if the last 4 digits of the number are divisible by 16, the full number is divisible by 16. So far as I know, if the last X digits of a number are divisible by 2^X, the entire number is divisible by 2^X.
@James: nice trick! (and I guess the proof arises from 10^x being always exactly divisible by 2^x, so "iff" also applies?)
perhaps less interesting but I guess you could do the same with powers of 5, iff the last X digits of a number are divisible by 5^x, then the entire number is divisible by 5^x...
given 3 sides, find area of this triangle
Rotate input square matrix 90 degrees CCW without rot90
Find last zero for each column
Approximation of Pi
Divisible by 10
Large Sum (inspired by Project Euler 13)
Radiation Heat Transfer — View Factors (5)
The 5th Root
Scrabble Scores - 6
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