Subtract 18/8 from 72/7
1st number: 10 2/7, 2nd number: 2 2/8
72/7 - 18/8 is 225/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
72/7 = 72 × 8/7 × 8 = 576/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
18/8 = 18 × 7/8 × 7 = 126/56 - Subtract the two like fractions:
576/56 - 126/56 = 576 - 126/56 = 450/56 - After reducing the fraction, the answer is 225/28
- In mixed form: 81/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/7-36/8 72/14-18/8 72/7-18/16 72/7-54/8 72/21-18/8 72/7-18/24 72/7-90/8 72/35-18/8 72/7-18/40 72/49-18/8 72/7-18/56