Subtract 7/56 from 21/12
1st number: 1 9/12, 2nd number: 7/56
21/12 - 7/56 is 13/8.
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,
7/56 = 7 × 3/56 × 3 = 21/168 - Subtract the two like fractions:
294/168 - 21/168 = 294 - 21/168 = 273/168 - After reducing the fraction, the answer is 13/8
- In mixed form: 15/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-7/56 21/12-14/56 21/24-7/56 63/12-7/56 21/12-21/56 21/36-7/56 21/12-35/56 21/60-7/56 21/12-49/56 21/84-7/56