Subtract 5/56 from 20/21
20/21 - 5/56 is 145/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
20/21 = 20 × 8/21 × 8 = 160/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
5/56 = 5 × 3/56 × 3 = 15/168 - Subtract the two like fractions:
160/168 - 15/168 = 160 - 15/168 = 145/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-5/56 20/21-10/56 20/42-5/56 60/21-5/56 20/21-15/56 20/63-5/56 20/21-25/56 20/21-35/56