Subtract 8/72 from 3/7
3/7 - 8/72 is 20/63.
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,
3/7 = 3 × 72/7 × 72 = 216/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
8/72 = 8 × 7/72 × 7 = 56/504 - Subtract the two like fractions:
216/504 - 56/504 = 216 - 56/504 = 160/504 - After reducing the fraction, the answer is 20/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7-8/72 3/7-16/72 3/14-8/72 9/7-8/72 3/7-24/72 3/21-8/72 15/7-8/72 3/7-40/72 3/35-8/72 21/7-8/72 3/7-56/72 3/49-8/72