Subtract 18/8 from 90/7
1st number: 12 6/7, 2nd number: 2 2/8
90/7 - 18/8 is 297/28.
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,
90/7 = 90 × 8/7 × 8 = 720/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
18/8 = 18 × 7/8 × 7 = 126/56 - Subtract the two like fractions:
720/56 - 126/56 = 720 - 126/56 = 594/56 - After reducing the fraction, the answer is 297/28
- In mixed form: 1017/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/7-36/8 90/14-18/8 90/7-18/16 90/7-54/8 90/21-18/8 90/7-18/24 90/7-90/8 90/35-18/8 90/7-18/40 90/49-18/8 90/7-18/56