A common denominator is 210.
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It is 330.
20 is the lowest common denominator for 4 and 10.
120
40
10/12 - 1/4 needs to have a common denominator. It appears 12 would be our common denominator.10/12 - (1/4 x 3/3) = 10/12 - 3/12 = 7/12.