3/4 - 2/3 = 9/12 - 8/12 = 1/125/6 + 1/2 = 5/6 + 3/6 = 8/6 = 4/35/6 - 3/8 = 20/24 - 9/24 = 11/247/10 + 7/15 = 21/30 + 14/30 = 35/30 = 7/619/20 - 37/40 = 38/40 - 37/40 = 1/407/20 + 3/4 = 7/20 + 15/20 = 22/20 = 11/1019/20 + 37/40 = 38/40 + 37/40 = 75/40 = 15/8
3/4 - 2/3 = 9/12 - 8/12 = 1/12
5/6 + 1/2 = 5/6 + 3/6 = 8/6 = 4/3
5/6 - 3/8 = 20/24 - 9/24 = 11/24
7/10 + 7/15 = 21/30 + 14/30 = 35/30 = 7/6
19/20 - 37/40 = 38/40 - 37/40 = 1/40
7/20 + 3/4 = 7/20 + 15/20 = 22/20 = 11/10
19/20 + 37/40 = 38/40 + 37/40 = 75/40 = 15/8