Subtract 20/54 from 15/18
15/18 - 20/54 is 25/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 54 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
15/18 = 15 × 3/18 × 3 = 45/54 - Likewise, for the 2nd fraction, since 54 × 1 = 54,
20/54 = 20 × 1/54 × 1 = 20/54 - Subtract the two like fractions:
45/54 - 20/54 = 45 - 20/54 = 25/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-20/54 15/18-40/54 15/36-20/54 45/18-20/54 15/18-60/54 15/54-20/54 75/18-20/54 15/90-20/54