Subtract 14/30 from 21/56, Solve 21/56

Subtract 14/30 from 21/56

21/56 - 14/30 is -11/120.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840
Likewise, for the 2nd fraction, since 30 × 28 = 840,
14/30 = 14 × 28/30 × 28 = 392/840
Subtract the two like fractions:
315/840 - 392/840 = 315 - 392/840 = -77/840
After reducing the fraction, the answer is -11/120

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