Subtract 20/18 from 30/15
1st number: 2 0/15, 2nd number: 1 2/18
30/15 - 20/18 is 8/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
30/15 = 30 × 6/15 × 6 = 180/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Subtract the two like fractions:
180/90 - 100/90 = 180 - 100/90 = 80/90 - After reducing the fraction, the answer is 8/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15-20/18 30/15-40/18 30/15-20/36 90/15-20/18 30/15-60/18 30/45-20/18 30/15-20/54 30/75-20/18 30/15-20/90