Subtract 30/9 from 15/20
1st number: 15/20, 2nd number: 3 3/9
15/20 - 30/9 is -31/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
30/9 = 30 × 20/9 × 20 = 600/180 - Subtract the two like fractions:
135/180 - 600/180 = 135 - 600/180 = -465/180 - After reducing the fraction, the answer is -31/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-30/9 15/20-60/9 15/40-30/9 15/20-30/18 45/20-30/9 15/20-90/9 15/60-30/9 15/20-30/27 75/20-30/9 15/20-30/45 15/20-30/63