31/20 minus 5/9 is 179/180
13/20 minus 3/5 is 1/20
14/20 minus 3/5 is 1/10
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
3/4 minus 1/5 is 11/20
9/20 − 5/14 = 13/140
-3/20 - 5/4 = -3/20 - 25/20 = -28/20 = -7/5
18/20 - 5/20 = 13/20
3/5 - 1/4 = 12/20 - 5/20 = 7/20.
11/20
-1/20
7/20
14/20 - 3/5 = 14/20 - 12/20 = 2/20 = 1/10