Subtract 28/16 from 8/42, Solve 8/42

Subtract 28/16 from 8/42

1^st number: 8/42, 2^nd number: 1 12/16

8/42 - 28/16 is -131/84.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 16 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 42 × 8 = 336,
8/42 = 8 × 8/42 × 8 = 64/336
Likewise, for the 2nd fraction, since 16 × 21 = 336,
28/16 = 28 × 21/16 × 21 = 588/336
Subtract the two like fractions:
64/336 - 588/336 = 64 - 588/336 = -524/336
After reducing the fraction, the answer is -131/84

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