Subtract 20/56 from 21/15
1st number: 1 6/15, 2nd number: 20/56
21/15 - 20/56 is 73/70.
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,
21/15 = 21 × 56/15 × 56 = 1176/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
20/56 = 20 × 15/56 × 15 = 300/840 - Subtract the two like fractions:
1176/840 - 300/840 = 1176 - 300/840 = 876/840 - After reducing the fraction, the answer is 73/70
- In mixed form: 13/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-20/56 21/15-40/56 21/30-20/56 63/15-20/56 21/15-60/56 21/45-20/56 21/75-20/56