Subtract 9/15 from 10/20
10/20 - 9/15 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
10/20 = 10 × 3/20 × 3 = 30/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
9/15 = 9 × 4/15 × 4 = 36/60 - Subtract the two like fractions:
30/60 - 36/60 = 30 - 36/60 = -6/60 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-18/15 10/40-9/15 10/20-9/30 30/20-9/15 10/20-27/15 10/60-9/15 10/20-9/45 50/20-9/15 10/20-45/15 10/20-9/75 70/20-9/15 10/20-63/15