Subtract 15/5 from 60/42, Solve 1 18/42

Subtract 15/5 from 60/42

1^st number: 1 18/42, 2^nd number: 3 0/5

60/42 - 15/5 is -11/7.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
60/42 = 60 × 5/42 × 5 = 300/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
15/5 = 15 × 42/5 × 42 = 630/210
Subtract the two like fractions:
300/210 - 630/210 = 300 - 630/210 = -330/210
After reducing the fraction, the answer is -11/7

MathStep (Works offline)

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