Subtract 21/56 from 21/12
1st number: 1 9/12, 2nd number: 21/56
21/12 - 21/56 is 11/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 12 × 14 = 168,
21/12 = 21 × 14/12 × 14 = 294/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
21/56 = 21 × 3/56 × 3 = 63/168 - Subtract the two like fractions:
294/168 - 63/168 = 294 - 63/168 = 231/168 - After reducing the fraction, the answer is 11/8
- In mixed form: 13/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-21/56 21/12-42/56 21/24-21/56 63/12-21/56 21/12-63/56 21/36-21/56 21/60-21/56 21/84-21/56