Subtract 28/20 from 20/15
1st number: 1 5/15, 2nd number: 1 8/20
20/15 - 28/20 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
20/15 = 20 × 4/15 × 4 = 80/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
28/20 = 28 × 3/20 × 3 = 84/60 - Subtract the two like fractions:
80/60 - 84/60 = 80 - 84/60 = -4/60 - After reducing the fraction, the answer is -1/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-28/20 20/15-56/20 20/30-28/20 20/15-28/40 60/15-28/20 20/15-84/20 20/45-28/20 20/15-28/60 20/75-28/20