(3/9)+(2/9)
(2/5) + (2/5)
(3/8)+(4/8)
(4/20)+(5/20)+(7/20)
(12/15) - (5/15)
(5/12)-(3/12)
(4/5)-(2/5)
(8/20) + (5/20)
(7/7)- (2/7)
(5/11)- (2/11)
2/5
5/9
16/20
13/20
3/11
4/5
7/15
7/8
2/12
5/7
