1/3 - 7/10
find the lowest common denominator = 30
10 x 1 - 7 x 3 divided by 30
(10-21)/30 = -11/30
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1 over 3 subtracted from 2 over 3 would yield 1 over 3.
3/10 - 4/5 = 3/10 - 8/10 = -5/10 = -1/2
.625
11/15 minus 3/10 = 13/30
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