Subtract 90/18 from 30/15
1st number: 2 0/15, 2nd number: 5 0/18
30/15 - 90/18 is -3/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
30/15 = 30 × 6/15 × 6 = 180/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
90/18 = 90 × 5/18 × 5 = 450/90 - Subtract the two like fractions:
180/90 - 450/90 = 180 - 450/90 = -270/90 - After reducing the fraction, the answer is -3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15-90/18 30/15-90/36 90/15-90/18 30/45-90/18 30/15-90/54 30/75-90/18