Subtract 15/20 from 15/30
15/30 - 15/20 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
15/30 = 15 × 2/30 × 2 = 30/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
15/20 = 15 × 3/20 × 3 = 45/60 - Subtract the two like fractions:
30/60 - 45/60 = 30 - 45/60 = -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: 15/30-30/20 15/60-15/20 15/30-15/40 45/30-15/20 15/30-45/20 15/90-15/20 15/30-15/60 75/30-15/20 15/30-75/20