Subtract 21/28 from 3/8
3/8 - 21/28 is -3/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 28 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 8 × 7 = 56,
3/8 = 3 × 7/8 × 7 = 21/56 - Likewise, for the 2nd fraction, since 28 × 2 = 56,
21/28 = 21 × 2/28 × 2 = 42/56 - Subtract the two like fractions:
21/56 - 42/56 = 21 - 42/56 = -21/56 - 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: 6/8-21/28 3/8-42/28 3/16-21/28 3/8-21/56 9/8-21/28 3/8-63/28 3/24-21/28 3/8-21/84 15/8-21/28 3/40-21/28 21/8-21/28 3/56-21/28