Subtract 20/30 from 10/18
10/18 - 20/30 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,
10/18 = 10 × 5/18 × 5 = 50/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
20/30 = 20 × 3/30 × 3 = 60/90 - Subtract the two like fractions:
50/90 - 60/90 = 50 - 60/90 = -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: 20/18-20/30 10/18-40/30 10/36-20/30 10/18-20/60 30/18-20/30 10/18-60/30 10/54-20/30 10/18-20/90 50/18-20/30 10/90-20/30 70/18-20/30