Subtract 20/42 from 5/27, Solve 5/27

Subtract 20/42 from 5/27

5/27 - 20/42 is -55/189.

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

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 27 × 14 = 378,
5/27 = 5 × 14/27 × 14 = 70/378
Likewise, for the 2nd fraction, since 42 × 9 = 378,
20/42 = 20 × 9/42 × 9 = 180/378
Subtract the two like fractions:
70/378 - 180/378 = 70 - 180/378 = -110/378
After reducing the fraction, the answer is -55/189

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