Subtract 63/42 from 45/56, Solve 45/56

Subtract 63/42 from 45/56

1^st number: 45/56, 2^nd number: 1 21/42

45/56 - 63/42 is -39/56.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 42 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 56 × 3 = 168,
45/56 = 45 × 3/56 × 3 = 135/168
Likewise, for the 2nd fraction, since 42 × 4 = 168,
63/42 = 63 × 4/42 × 4 = 252/168
Subtract the two like fractions:
135/168 - 252/168 = 135 - 252/168 = -117/168
After reducing the fraction, the answer is -39/56

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