Subtract 7/18 from 18/45
18/45 - 7/18 is 1/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
18/45 = 18 × 2/45 × 2 = 36/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Subtract the two like fractions:
36/90 - 35/90 = 36 - 35/90 = 1/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45-7/18 18/45-14/18 18/90-7/18 18/45-7/36 54/45-7/18 18/45-21/18 18/45-7/54 90/45-7/18 18/45-35/18 18/45-7/90 18/45-49/18