Subtract 20/12 from 15/20
1st number: 15/20, 2nd number: 1 8/12
15/20 - 20/12 is -11/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 12 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 12 × 5 = 60,
20/12 = 20 × 5/12 × 5 = 100/60 - Subtract the two like fractions:
45/60 - 100/60 = 45 - 100/60 = -55/60 - After reducing the fraction, the answer is -11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-20/12 15/20-40/12 15/40-20/12 15/20-20/24 45/20-20/12 15/20-60/12 15/60-20/12 15/20-20/36 75/20-20/12 15/20-20/60 15/20-20/84