Subtract 15/90 from 7/18
7/18 - 15/90 is 2/9.
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,
7/18 = 7 × 5/18 × 5 = 35/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
15/90 = 15 × 1/90 × 1 = 15/90 - Subtract the two like fractions:
35/90 - 15/90 = 35 - 15/90 = 20/90 - After reducing the fraction, the answer is 2/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-15/90 7/18-30/90 7/36-15/90 21/18-15/90 7/18-45/90 7/54-15/90 35/18-15/90 7/18-75/90 7/90-15/90 49/18-15/90