Subtract 21/28 from 2/4
2/4 - 21/28 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 28 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 4 × 7 = 28,
2/4 = 2 × 7/4 × 7 = 14/28 - Likewise, for the 2nd fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Subtract the two like fractions:
14/28 - 21/28 = 14 - 21/28 = -7/28 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/4-42/28 2/8-21/28 2/4-21/56 6/4-21/28 2/4-63/28 2/12-21/28 2/4-21/84 10/4-21/28 2/20-21/28 14/4-21/28 2/28-21/28