Subtract 20/72 from 8/7
1st number: 1 1/7, 2nd number: 20/72
8/7 - 20/72 is 109/126.
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,
8/7 = 8 × 72/7 × 72 = 576/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Subtract the two like fractions:
576/504 - 140/504 = 576 - 140/504 = 436/504 - After reducing the fraction, the answer is 109/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-20/72 8/7-40/72 8/14-20/72 24/7-20/72 8/7-60/72 8/21-20/72 40/7-20/72 8/35-20/72 56/7-20/72 8/49-20/72