13/20 minus 3/5 is 1/20
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13/20 - 3/15 = 9/20
Converting to twentieths, we get 8 over 20 minus 15 over 20, resulting in minus 7 over 20.
3/4 minus 1/10 is 13/20
13/20 - 3/5 = 13/20 - 12/20 = 1/20
3/5 - 3/4 = 12/20 - 15/20 = (12 - 15)/20 = -3/20