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...
Find the sum of the elements in the "second" diagonal
Solving Quadratic Equations (Version 1)
Return fibonacci sequence do not use loop and condition
Square a Number
Find my daddy long leg (No 's')
Is it really a 5?
Divisible by 10
Divisible by 5
Word Distance - Sum
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