Subtract 81/56 from 21/60, Solve 21/60

Subtract 81/56 from 21/60

1^st number: 21/60, 2^nd number: 1 25/56

21/60 - 81/56 is -307/280.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 56 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 60 × 14 = 840,
21/60 = 21 × 14/60 × 14 = 294/840
Likewise, for the 2nd fraction, since 56 × 15 = 840,
81/56 = 81 × 15/56 × 15 = 1215/840
Subtract the two like fractions:
294/840 - 1215/840 = 294 - 1215/840 = -921/840
After reducing the fraction, the answer is -307/280

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