Subtract 40/7 from 21/56
1st number: 21/56, 2nd number: 5 5/7
21/56 - 40/7 is -299/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 7 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 56 × 1 = 56,
21/56 = 21 × 1/56 × 1 = 21/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
40/7 = 40 × 8/7 × 8 = 320/56 - Subtract the two like fractions:
21/56 - 320/56 = 21 - 320/56 = -299/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-40/7 21/56-80/7 21/56-40/14 63/56-40/7 21/56-40/21 21/56-40/35 21/56-40/49