Subtract 21/12 from 7/2
1st number: 3 1/2, 2nd number: 1 9/12
7/2 - 21/12 is 7/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 2 × 6 = 12,
7/2 = 7 × 6/2 × 6 = 42/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12 - Subtract the two like fractions:
42/12 - 21/12 = 42 - 21/12 = 21/12 - After reducing the fraction, the answer is 7/4
- In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2-21/12 7/2-42/12 7/4-21/12 7/2-21/24 21/2-21/12 7/2-63/12 7/6-21/12 7/2-21/36 35/2-21/12 7/10-21/12 7/2-21/60 49/2-21/12 7/14-21/12 7/2-21/84