Subtract 21/3 from 7/28
1st number: 7/28, 2nd number: 7 0/3
7/28 - 21/3 is -27/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 3 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
7/28 = 7 × 3/28 × 3 = 21/84 - Likewise, for the 2nd fraction, since 3 × 28 = 84,
21/3 = 21 × 28/3 × 28 = 588/84 - Subtract the two like fractions:
21/84 - 588/84 = 21 - 588/84 = -567/84 - After reducing the fraction, the answer is -27/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/28-21/3 7/28-42/3 7/56-21/3 7/28-21/6 21/28-21/3 7/28-63/3 7/84-21/3 7/28-21/9 35/28-21/3 7/28-21/15 49/28-21/3