Subtract 3/56 from 21/8
1st number: 2 5/8, 2nd number: 3/56
21/8 - 3/56 is 18/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 56 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 8 × 7 = 56,
21/8 = 21 × 7/8 × 7 = 147/56 - Likewise, for the 2nd fraction, since 56 × 1 = 56,
3/56 = 3 × 1/56 × 1 = 3/56 - Subtract the two like fractions:
147/56 - 3/56 = 147 - 3/56 = 144/56 - After reducing the fraction, the answer is 18/7
- In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-3/56 21/8-6/56 21/16-3/56 63/8-3/56 21/8-9/56 21/24-3/56 21/8-15/56 21/40-3/56 21/8-21/56 21/56-3/56