Subtract 50/27 from 18/42, Solve 18/42

Subtract 50/27 from 18/42

1^st number: 18/42, 2^nd number: 1 23/27

18/42 - 50/27 is -269/189.

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,
18/42 = 18 × 9/42 × 9 = 162/378
Likewise, for the 2nd fraction, since 27 × 14 = 378,
50/27 = 50 × 14/27 × 14 = 700/378
Subtract the two like fractions:
162/378 - 700/378 = 162 - 700/378 = -538/378
After reducing the fraction, the answer is -269/189

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad