Subtract 18/72 from 8/7
1st number: 1 1/7, 2nd number: 18/72
8/7 - 18/72 is 25/28.
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,
18/72 = 18 × 7/72 × 7 = 126/504 - Subtract the two like fractions:
576/504 - 126/504 = 576 - 126/504 = 450/504 - After reducing the fraction, the answer is 25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-18/72 8/7-36/72 8/14-18/72 24/7-18/72 8/7-54/72 8/21-18/72 40/7-18/72 8/7-90/72 8/35-18/72 56/7-18/72 8/49-18/72