4/9 + 1/27
13/27
5/21 - 1/7
2/21
4/20
1/5
1/2 + 1/4 + 3/8
9/8 = 1 1/8
5/7 - 1/4
13/28
9/12
3/4
2/3 + 1/4 + 1/12
12/12 = 1
1/2 - 1/10
4/10 = 2/5
12/15
4/5
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