Subtract 90/18 from 18/5
1st number: 3 3/5, 2nd number: 5 0/18
18/5 - 90/18 is -7/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
18/5 = 18 × 18/5 × 18 = 324/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
90/18 = 90 × 5/18 × 5 = 450/90 - Subtract the two like fractions:
324/90 - 450/90 = 324 - 450/90 = -126/90 - After reducing the fraction, the answer is -7/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5-90/18 18/10-90/18 18/5-90/36 54/5-90/18 18/15-90/18 18/5-90/54 90/5-90/18 18/25-90/18 18/35-90/18