Subtract 21/72 from 6/7
6/7 - 21/72 is 95/168.
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,
6/7 = 6 × 72/7 × 72 = 432/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Subtract the two like fractions:
432/504 - 147/504 = 432 - 147/504 = 285/504 - After reducing the fraction, the answer is 95/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/7-21/72 6/7-42/72 6/14-21/72 18/7-21/72 6/7-63/72 6/21-21/72 30/7-21/72 6/35-21/72 42/7-21/72 6/49-21/72