Use benchmarks to estimate the sum 13/15 + 1/8
The answer for this is 119/120. So I guess you can round it to get yourself to, 1 whole.
The least common multiple of denominators 8 and 15 is 120.
Write the fractions so that their denominator is 120.
13 / 15 + 1 / 8 =
8 • 13 / 8 • 15 + 15 • 1 / 15 • 8 =
104 / 120 + 15 / 120 = 119 / 120