3/10 - 11/15= 9/30 - 22/30 = -13/30
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11/15 minus 3/10 = 13/30
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
11/15 - 3/15 = 8/15
Find the least common denominator of 10 and 15, which is 30. If 15 is doubled to 30, the 8 over it must be doubled to 16. If 10 is tripled to 30, the 9 over it must be tripled to 27. 27 over 30 minus 16 over 30 is 11 over 30.
8/15 minus 7/20 is 11/60