Subtract 20/16 from 4/42, Solve 4/42

Subtract 20/16 from 4/42

1^st number: 4/42, 2^nd number: 1 4/16

4/42 - 20/16 is -97/84.

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,
4/42 = 4 × 8/42 × 8 = 32/336
Likewise, for the 2nd fraction, since 16 × 21 = 336,
20/16 = 20 × 21/16 × 21 = 420/336
Subtract the two like fractions:
32/336 - 420/336 = 32 - 420/336 = -388/336
After reducing the fraction, the answer is -97/84

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