Subtract 21/15 from 7/2
1st number: 3 1/2, 2nd number: 1 6/15
7/2 - 21/15 is 21/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
7/2 = 7 × 15/2 × 15 = 105/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Subtract the two like fractions:
105/30 - 42/30 = 105 - 42/30 = 63/30 - After reducing the fraction, the answer is 21/10
- In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2-21/15 7/2-42/15 7/4-21/15 7/2-21/30 21/2-21/15 7/2-63/15 7/6-21/15 7/2-21/45 35/2-21/15 7/10-21/15 7/2-21/75 49/2-21/15 7/14-21/15