Subtract 42/32 from 21/56, Solve 21/56

Subtract 42/32 from 21/56

1^st number: 21/56, 2^nd number: 1 10/32

21/56 - 42/32 is -15/16.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 32 is 224

Next, find the equivalent fraction of both fractional numbers with denominator 224
For the 1st fraction, since 56 × 4 = 224,
21/56 = 21 × 4/56 × 4 = 84/224
Likewise, for the 2nd fraction, since 32 × 7 = 224,
42/32 = 42 × 7/32 × 7 = 294/224
Subtract the two like fractions:
84/224 - 294/224 = 84 - 294/224 = -210/224
After reducing the fraction, the answer is -15/16

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