Subtract 3/28 from 21/27
21/27 - 3/28 is 169/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 28 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 27 × 28 = 756,
21/27 = 21 × 28/27 × 28 = 588/756 - Likewise, for the 2nd fraction, since 28 × 27 = 756,
3/28 = 3 × 27/28 × 27 = 81/756 - Subtract the two like fractions:
588/756 - 81/756 = 588 - 81/756 = 507/756 - After reducing the fraction, the answer is 169/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-3/28 21/27-6/28 21/54-3/28 21/27-3/56 63/27-3/28 21/27-9/28 21/81-3/28 21/27-3/84 21/27-15/28 21/27-21/28