Subtract 7/18 from 9/45
9/45 - 7/18 is -17/90.
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,
9/45 = 9 × 2/45 × 2 = 18/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Subtract the two like fractions:
18/90 - 35/90 = 18 - 35/90 = -17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/45-7/18 9/45-14/18 9/90-7/18 9/45-7/36 27/45-7/18 9/45-21/18 9/45-7/54 9/45-35/18 9/45-7/90 63/45-7/18 9/45-49/18