Subtract 1/18 from 18/45
18/45 - 1/18 is 31/90.
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,
1/18 = 1 × 5/18 × 5 = 5/90 - Subtract the two like fractions:
36/90 - 5/90 = 36 - 5/90 = 31/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45-1/18 18/45-2/18 18/90-1/18 18/45-1/36 54/45-1/18 18/45-3/18 18/45-1/54 90/45-1/18 18/45-5/18 18/45-1/90 18/45-7/18