Subtract 90/15 from 18/24
1st number: 18/24, 2nd number: 6 0/15
18/24 - 90/15 is -21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
18/24 = 18 × 5/24 × 5 = 90/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
90/15 = 90 × 8/15 × 8 = 720/120 - Subtract the two like fractions:
90/120 - 720/120 = 90 - 720/120 = -630/120 - After reducing the fraction, the answer is -21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24-90/15 18/48-90/15 18/24-90/30 54/24-90/15 18/72-90/15 18/24-90/45 90/24-90/15 18/24-90/75