Lowest Common Denominator
7 and 9
63
6/16 + 1/4
10/16
16/18 - 2/36
5/6
4/31 + 4/62
6/31
14/60 - 2/40
11/60
6 and 15
30
3/9 + 4/27
13/27
3/6 - 4/15
7/30
11/110 + 17/22
48/55
5/6 - 7/9
1/18
2 and 19
38
2/55 + 10/11
52/55
9/11 - 10/55
7/11
10/26 + 3/4
59/52
20/52 - 1/4
7/52
9 and 37
333
11/20 + 3/4
13/10
4/5 - 1/4
11/20
17/86 + 19/43
55/86
15/74 - 4/37
7/74
11 and 23
253
9/10 + 7/30
17/15
7/8 - 4/16
5/8
19/76 + 2/4
3/4
3/4 - 18/28
3/28