Subtract 21/8 from 21/60, Solve 21/60

Subtract 21/8 from 21/60

1^st number: 21/60, 2^nd number: 2 5/8

21/60 - 21/8 is -91/40.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 8 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 60 × 2 = 120,
21/60 = 21 × 2/60 × 2 = 42/120
Likewise, for the 2nd fraction, since 8 × 15 = 120,
21/8 = 21 × 15/8 × 15 = 315/120
Subtract the two like fractions:
42/120 - 315/120 = 42 - 315/120 = -273/120
After reducing the fraction, the answer is -91/40

MathStep (Works offline)

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