6/10 = 3/5
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3/8 minus 1/5 is 7/40
5 and 8/10 minus 3 and 1/2 = 2 and 3/10
Call it 21 fifths minus 13 fifths, ie 8 fifths which is one-and-three-fifths
Since LCM(4, 5, 10) = 20, 1/4 - 2/5 - 3/10 = 5/20 - 8/20 - 6/20 = -9/20
8 - 2 4/5 = 5 1/5