Subtract 21/7 from 45/56
1st number: 45/56, 2nd number: 3 0/7
45/56 - 21/7 is -123/56.
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,
45/56 = 45 × 1/56 × 1 = 45/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
21/7 = 21 × 8/7 × 8 = 168/56 - Subtract the two like fractions:
45/56 - 168/56 = 45 - 168/56 = -123/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/56-21/7 45/56-42/7 45/56-21/14 45/56-63/7 45/56-21/35 45/56-21/49