15/56 is in simplest form because no number can be divisible by them both except for one and if one is the only way to divide it than it is in simplest form.
15 over 28
8/15
14/15
168/15 = 56/5
14 __ 15
56/71 is in its simplest form.
27/56 is in its simplest form.
56/225 is in its simplest form.
56/65 is in its simplest form.
51/56 is in its simplest form.
56/55 is already in its simplest form
56/27 cannot be simplified.