Subtract 56/18 from 6/42, Solve 6/42

Subtract 56/18 from 6/42

1^st number: 6/42, 2^nd number: 3 2/18

6/42 - 56/18 is -187/63.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 42 × 3 = 126,
6/42 = 6 × 3/42 × 3 = 18/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
56/18 = 56 × 7/18 × 7 = 392/126
Subtract the two like fractions:
18/126 - 392/126 = 18 - 392/126 = -374/126
After reducing the fraction, the answer is -187/63

MathStep (Works offline)

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