Subtract 15/30 from 15/20
15/20 - 15/30 is 1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
15/20 = 15 × 3/20 × 3 = 45/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
15/30 = 15 × 2/30 × 2 = 30/60 - Subtract the two like fractions:
45/60 - 30/60 = 45 - 30/60 = 15/60 - After reducing the fraction, the answer is 1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-15/30 15/40-15/30 15/20-15/60 45/20-15/30 15/20-45/30 15/60-15/30 15/20-15/90 75/20-15/30 15/20-75/30