Subtract 3/21 from 1/56
1/56 - 3/21 is -1/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
1/56 = 1 × 3/56 × 3 = 3/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
3/21 = 3 × 8/21 × 8 = 24/168 - Subtract the two like fractions:
3/168 - 24/168 = 3 - 24/168 = -21/168 - After reducing the fraction, the answer is -1/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/56-3/21 1/56-6/21 1/56-3/42 3/56-3/21 1/56-9/21 1/56-3/63 5/56-3/21 1/56-15/21 7/56-3/21