Subtract 15/30 from 7/18
7/18 - 15/30 is -1/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 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 30 × 3 = 90,
15/30 = 15 × 3/30 × 3 = 45/90 - Subtract the two like fractions:
35/90 - 45/90 = 35 - 45/90 = -10/90 - After reducing the fraction, the answer is -1/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18-15/30 7/36-15/30 7/18-15/60 21/18-15/30 7/18-45/30 7/54-15/30 7/18-15/90 35/18-15/30 7/18-75/30 7/90-15/30 49/18-15/30