Subtract 21/40 from 28/60
28/60 - 21/40 is -7/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 60 × 2 = 120,
28/60 = 28 × 2/60 × 2 = 56/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Subtract the two like fractions:
56/120 - 63/120 = 56 - 63/120 = -7/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/60-21/40 28/60-42/40 28/60-21/80 84/60-21/40 28/60-63/40