Subtract 63/32 from 12/42, Solve 12/42

Subtract 63/32 from 12/42

1^st number: 12/42, 2^nd number: 1 31/32

12/42 - 63/32 is -377/224.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 32 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 42 × 16 = 672,
12/42 = 12 × 16/42 × 16 = 192/672
Likewise, for the 2nd fraction, since 32 × 21 = 672,
63/32 = 63 × 21/32 × 21 = 1323/672
Subtract the two like fractions:
192/672 - 1323/672 = 192 - 1323/672 = -1131/672
After reducing the fraction, the answer is -377/224

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