Subtract 56/90 from 15/18
15/18 - 56/90 is 19/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
15/18 = 15 × 5/18 × 5 = 75/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
56/90 = 56 × 1/90 × 1 = 56/90 - Subtract the two like fractions:
75/90 - 56/90 = 75 - 56/90 = 19/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-56/90 15/36-56/90 45/18-56/90 15/54-56/90 75/18-56/90 15/90-56/90