Subtract 7/18 from 18/30
18/30 - 7/18 is 19/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
18/30 = 18 × 3/30 × 3 = 54/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Subtract the two like fractions:
54/90 - 35/90 = 54 - 35/90 = 19/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30-7/18 18/30-14/18 18/60-7/18 18/30-7/36 54/30-7/18 18/30-21/18 18/90-7/18 18/30-7/54 90/30-7/18 18/30-35/18 18/30-7/90 18/30-49/18