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