Subtract 5/56 from 4/21
4/21 - 5/56 is 17/168.
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,
4/21 = 4 × 8/21 × 8 = 32/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
5/56 = 5 × 3/56 × 3 = 15/168 - Subtract the two like fractions:
32/168 - 15/168 = 32 - 15/168 = 17/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-5/56 4/21-10/56 4/42-5/56 12/21-5/56 4/21-15/56 4/63-5/56 20/21-5/56 4/21-25/56 28/21-5/56 4/21-35/56