Subtract 15/56 from 21/7
1st number: 3 0/7, 2nd number: 15/56
21/7 - 15/56 is 153/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 56 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
21/7 = 21 × 8/7 × 8 = 168/56 - Likewise, for the 2nd fraction, since 56 × 1 = 56,
15/56 = 15 × 1/56 × 1 = 15/56 - Subtract the two like fractions:
168/56 - 15/56 = 168 - 15/56 = 153/56 - In mixed form: 241/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7-15/56 21/7-30/56 21/14-15/56 63/7-15/56 21/7-45/56 21/7-75/56 21/35-15/56 21/49-15/56