Subtract 7/8 from 21/60, Solve 21/60

Subtract 7/8 from 21/60

21/60 - 7/8 is -21/40.

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,
7/8 = 7 × 15/8 × 15 = 105/120
Subtract the two like fractions:
42/120 - 105/120 = 42 - 105/120 = -63/120
After reducing the fraction, the answer is -21/40

MathStep (Works offline)

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