Subtract 81/6 from 90/18
1st number: 5 0/18, 2nd number: 13 3/6
90/18 - 81/6 is -17/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 6 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 18 × 1 = 18,
90/18 = 90 × 1/18 × 1 = 90/18 - Likewise, for the 2nd fraction, since 6 × 3 = 18,
81/6 = 81 × 3/6 × 3 = 243/18 - Subtract the two like fractions:
90/18 - 243/18 = 90 - 243/18 = -153/18 - After reducing the fraction, the answer is -17/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/36-81/6 90/18-81/12 90/54-81/6 90/18-81/18 90/18-81/30 90/18-81/42