Subtract 72/15 from 42/4, Solve 10 2/4

Subtract 72/15 from 42/4

1^st number: 10 2/4, 2^nd number: 4 12/15

42/4 - 72/15 is 57/10.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 15 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 4 × 15 = 60,
42/4 = 42 × 15/4 × 15 = 630/60
Likewise, for the 2nd fraction, since 15 × 4 = 60,
72/15 = 72 × 4/15 × 4 = 288/60
Subtract the two like fractions:
630/60 - 288/60 = 630 - 288/60 = 342/60
After reducing the fraction, the answer is 57/10
In mixed form: 57/10

MathStep (Works offline)

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