5/8 - 7/20 = 25/40 - 14/40 = 11/40
21/25 − 2/5 = 11/25
6/11 - 1/6 is 25/66
11/12 - 2/9 = 25/36
20 over 13
17/25 − 3/20 = 265/500. This simplfies further to 53/100
25 - (20%) = 20
-3/20 - 5/4 = -3/20 - 25/20 = -28/20 = -7/5
-11 - 8 - 6 = -25
11
7/10 = 14/20 14/20 + 11/20 = 25/20 = 5/4
45