Subtract 56/15 from 7/42, Solve 7/42

Subtract 56/15 from 7/42

1^st number: 7/42, 2^nd number: 3 11/15

7/42 - 56/15 is -107/30.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
7/42 = 7 × 5/42 × 5 = 35/210
Likewise, for the 2nd fraction, since 15 × 14 = 210,
56/15 = 56 × 14/15 × 14 = 784/210
Subtract the two like fractions:
35/210 - 784/210 = 35 - 784/210 = -749/210
After reducing the fraction, the answer is -107/30

MathStep (Works offline)

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