Subtract 21/56 from 4/15
4/15 - 21/56 is -13/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 15 × 56 = 840,
4/15 = 4 × 56/15 × 56 = 224/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Subtract the two like fractions:
224/840 - 315/840 = 224 - 315/840 = -91/840 - After reducing the fraction, the answer is -13/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/15-21/56 4/15-42/56 4/30-21/56 12/15-21/56 4/15-63/56 4/45-21/56 20/15-21/56 4/75-21/56 28/15-21/56