Subtract 21/72 from 15/7
1st number: 2 1/7, 2nd number: 21/72
15/7 - 21/72 is 311/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 7 × 72 = 504,
15/7 = 15 × 72/7 × 72 = 1080/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Subtract the two like fractions:
1080/504 - 147/504 = 1080 - 147/504 = 933/504 - After reducing the fraction, the answer is 311/168
- In mixed form: 1143/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/7-21/72 15/7-42/72 15/14-21/72 45/7-21/72 15/7-63/72 15/21-21/72 75/7-21/72 15/35-21/72 15/49-21/72