Subtract 21/12 from 50/56, Solve 50/56

Subtract 21/12 from 50/56

1^st number: 50/56, 2^nd number: 1 9/12

50/56 - 21/12 is -6/7.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 12 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 56 × 3 = 168,
50/56 = 50 × 3/56 × 3 = 150/168
Likewise, for the 2nd fraction, since 12 × 14 = 168,
21/12 = 21 × 14/12 × 14 = 294/168
Subtract the two like fractions:
150/168 - 294/168 = 150 - 294/168 = -144/168
After reducing the fraction, the answer is -6/7

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