Math
posted by William Bent .
Write 8 fractions equal to onehalf (not including onehalf) using only the digits 0, 1, 2 and 5. Each digit may be used more than once, but you may not use decimal points or arithmatic operatons. Numerators cannot be larger than 100. You may not use negative numbers.

Here's a start 
5/10
50/100
10/20
I'm sure you can think of several other fractions.