Subtract 21/3 from 7/4
1st number: 1 3/4, 2nd number: 7 0/3
7/4 - 21/3 is -21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 3 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 4 × 3 = 12,
7/4 = 7 × 3/4 × 3 = 21/12 - Likewise, for the 2nd fraction, since 3 × 4 = 12,
21/3 = 21 × 4/3 × 4 = 84/12 - Subtract the two like fractions:
21/12 - 84/12 = 21 - 84/12 = -63/12 - After reducing the fraction, the answer is -21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-21/3 7/4-42/3 7/8-21/3 7/4-21/6 21/4-21/3 7/4-63/3 7/12-21/3 7/4-21/9 35/4-21/3 7/20-21/3 7/4-21/15 49/4-21/3 7/28-21/3