Subtract 18/20 from 9/12
9/12 - 18/20 is -3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
9/12 = 9 × 5/12 × 5 = 45/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Subtract the two like fractions:
45/60 - 54/60 = 45 - 54/60 = -9/60 - After reducing the fraction, the answer is -3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12-18/20 9/12-36/20 9/24-18/20 9/12-18/40 27/12-18/20 9/12-54/20 9/36-18/20 9/12-18/60 45/12-18/20 9/12-90/20 9/60-18/20 63/12-18/20 9/84-18/20