Subtract 21/3 from 7/2
1st number: 3 1/2, 2nd number: 7 0/3
7/2 - 21/3 is -7/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 3 is 6
Next, find the equivalent fraction of both fractional numbers with denominator 6 - For the 1st fraction, since 2 × 3 = 6,
7/2 = 7 × 3/2 × 3 = 21/6 - Likewise, for the 2nd fraction, since 3 × 2 = 6,
21/3 = 21 × 2/3 × 2 = 42/6 - Subtract the two like fractions:
21/6 - 42/6 = 21 - 42/6 = -21/6 - After reducing the fraction, the answer is -7/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2-21/3 7/2-42/3 7/4-21/3 7/2-21/6 21/2-21/3 7/2-63/3 7/6-21/3 7/2-21/9 35/2-21/3 7/10-21/3 7/2-21/15 49/2-21/3 7/14-21/3