Subtract 5/18 from 7/90
7/90 - 5/18 is -1/5.
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,
7/90 = 7 × 1/90 × 1 = 7/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
5/18 = 5 × 5/18 × 5 = 25/90 - Subtract the two like fractions:
7/90 - 25/90 = 7 - 25/90 = -18/90 - After reducing the fraction, the answer is -1/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-5/18 7/90-10/18 7/90-5/36 21/90-5/18 7/90-15/18 7/90-5/54 35/90-5/18 7/90-25/18 7/90-5/90 49/90-5/18 7/90-35/18