Subtract 28/10 from 20/12
1st number: 1 8/12, 2nd number: 2 8/10
20/12 - 28/10 is -17/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
20/12 = 20 × 5/12 × 5 = 100/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
28/10 = 28 × 6/10 × 6 = 168/60 - Subtract the two like fractions:
100/60 - 168/60 = 100 - 168/60 = -68/60 - After reducing the fraction, the answer is -17/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-28/10 20/12-56/10 20/24-28/10 20/12-28/20 60/12-28/10 20/12-84/10 20/36-28/10 20/12-28/30 20/60-28/10 20/12-28/50 20/84-28/10 20/12-28/70