Subtract 21/24 from 21/15
1st number: 1 6/15, 2nd number: 21/24
21/15 - 21/24 is 21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Subtract the two like fractions:
168/120 - 105/120 = 168 - 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
Related: 42/15-21/24 21/15-42/24 21/30-21/24 21/15-21/48 63/15-21/24 21/15-63/24 21/45-21/24 21/15-21/72 21/75-21/24