Subtract 21/3 from 21/4
1st number: 5 1/4, 2nd number: 7 0/3
21/4 - 21/3 is -7/4.
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,
21/4 = 21 × 3/4 × 3 = 63/12 - Likewise, for the 2nd fraction, since 3 × 4 = 12,
21/3 = 21 × 4/3 × 4 = 84/12 - Subtract the two like fractions:
63/12 - 84/12 = 63 - 84/12 = -21/12 - After reducing the fraction, the answer is -7/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-21/3 21/4-42/3 21/8-21/3 21/4-21/6 63/4-21/3 21/4-63/3 21/12-21/3 21/4-21/9 21/20-21/3 21/4-21/15 21/28-21/3