Subtract 8/18 from 20/30
20/30 - 8/18 is 2/9.
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,
20/30 = 20 × 3/30 × 3 = 60/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
8/18 = 8 × 5/18 × 5 = 40/90 - Subtract the two like fractions:
60/90 - 40/90 = 60 - 40/90 = 20/90 - After reducing the fraction, the answer is 2/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-8/18 20/30-16/18 20/60-8/18 20/30-8/36 60/30-8/18 20/30-24/18 20/90-8/18 20/30-8/54 20/30-40/18 20/30-8/90 20/30-56/18