Subtract 70/16 from 28/72, Solve 28/72

Subtract 70/16 from 28/72

1^st number: 28/72, 2^nd number: 4 6/16

28/72 - 70/16 is -287/72.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 16 is 144

Next, find the equivalent fraction of both fractional numbers with denominator 144
For the 1st fraction, since 72 × 2 = 144,
28/72 = 28 × 2/72 × 2 = 56/144
Likewise, for the 2nd fraction, since 16 × 9 = 144,
70/16 = 70 × 9/16 × 9 = 630/144
Subtract the two like fractions:
56/144 - 630/144 = 56 - 630/144 = -574/144
After reducing the fraction, the answer is -287/72

MathStep (Works offline)

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