Subtract 21/30 from 15/7
1st number: 2 1/7, 2nd number: 21/30
15/7 - 21/30 is 101/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 7 × 30 = 210,
15/7 = 15 × 30/7 × 30 = 450/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
450/210 - 147/210 = 450 - 147/210 = 303/210 - After reducing the fraction, the answer is 101/70
- In mixed form: 131/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/7-21/30 15/7-42/30 15/14-21/30 15/7-21/60 45/7-21/30 15/7-63/30 15/21-21/30 15/7-21/90 75/7-21/30 15/35-21/30 15/49-21/30