Subtract 8/27 from 4/42, Solve 4/42

Subtract 8/27 from 4/42

4/42 - 8/27 is -38/189.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 42 × 9 = 378,
4/42 = 4 × 9/42 × 9 = 36/378
Likewise, for the 2nd fraction, since 27 × 14 = 378,
8/27 = 8 × 14/27 × 14 = 112/378
Subtract the two like fractions:
36/378 - 112/378 = 36 - 112/378 = -76/378
After reducing the fraction, the answer is -38/189

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