2.2
10/28 = 5/1410/28 = 5/1410/28 = 5/1410/28 = 5/14
-117
28 * 5 = 784
28/5 = 53/5
GCD(5, 28) = 140
28
5 x 28 = 140!
28*5 = 140
5.6
Since the numbers 5 and 28 share no common positive integer factor, the proper fraction 5/28 is already expressed in simplest form.
1/7 + 1/2 + 5/28 = 4/28 + 14/28 + 5/28 = 23/28
5 over 8 divided by 28 = (5/8)/28 = 5/224 NB: Division is NOT associative.