Subtract 90/18 from 90/7
1st number: 12 6/7, 2nd number: 5 0/18
90/7 - 90/18 is 55/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 7 × 18 = 126,
90/7 = 90 × 18/7 × 18 = 1620/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
90/18 = 90 × 7/18 × 7 = 630/126 - Subtract the two like fractions:
1620/126 - 630/126 = 1620 - 630/126 = 990/126 - After reducing the fraction, the answer is 55/7
- In mixed form: 76/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/14-90/18 90/7-90/36 90/21-90/18 90/7-90/54 90/35-90/18 90/49-90/18