Subtract 90/7 from 90/18
1st number: 5 0/18, 2nd number: 12 6/7
90/18 - 90/7 is -55/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Likewise, for the 2nd fraction, since 7 × 18 = 126,
90/7 = 90 × 18/7 × 18 = 1620/126 - Subtract the two like fractions:
630/126 - 1620/126 = 630 - 1620/126 = -990/126 - After reducing the fraction, the answer is -55/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/36-90/7 90/18-90/14 90/54-90/7 90/18-90/21 90/18-90/35 90/18-90/49