Subtract 18/15 from 20/50
1st number: 20/50, 2nd number: 1 3/15
20/50 - 18/15 is -4/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 15 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 50 × 3 = 150,
20/50 = 20 × 3/50 × 3 = 60/150 - Likewise, for the 2nd fraction, since 15 × 10 = 150,
18/15 = 18 × 10/15 × 10 = 180/150 - Subtract the two like fractions:
60/150 - 180/150 = 60 - 180/150 = -120/150 - After reducing the fraction, the answer is -4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/50-18/15 20/50-36/15 20/50-18/30 60/50-18/15 20/50-54/15 20/50-18/45 20/50-90/15 20/50-18/75