Subtract 21/56 from 9/12
9/12 - 21/56 is 3/8.
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,
9/12 = 9 × 14/12 × 14 = 126/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
21/56 = 21 × 3/56 × 3 = 63/168 - Subtract the two like fractions:
126/168 - 63/168 = 126 - 63/168 = 63/168 - After reducing the fraction, the answer is 3/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-21/56 9/12-42/56 9/24-21/56 27/12-21/56 9/12-63/56 9/36-21/56 45/12-21/56 9/60-21/56 63/12-21/56 9/84-21/56