Subtract 9/56 from 3/21
3/21 - 9/56 is -1/56.
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,
3/21 = 3 × 8/21 × 8 = 24/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
9/56 = 9 × 3/56 × 3 = 27/168 - Subtract the two like fractions:
24/168 - 27/168 = 24 - 27/168 = -3/168 - After reducing the fraction, the answer is -1/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-9/56 3/21-18/56 3/42-9/56 9/21-9/56 3/21-27/56 3/63-9/56 15/21-9/56 3/21-45/56 3/21-63/56