Subtract 9/21 from 27/56
27/56 - 9/21 is 3/56.
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,
27/56 = 27 × 3/56 × 3 = 81/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
9/21 = 9 × 8/21 × 8 = 72/168 - Subtract the two like fractions:
81/168 - 72/168 = 81 - 72/168 = 9/168 - After reducing the fraction, the answer is 3/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/56-9/21 27/56-18/21 27/56-9/42 81/56-9/21 27/56-27/21 27/56-9/63 27/56-45/21 27/56-63/21