Subtract 18/12 from 20/9
1st number: 2 2/9, 2nd number: 1 6/12
20/9 - 18/12 is 13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
20/9 = 20 × 4/9 × 4 = 80/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
18/12 = 18 × 3/12 × 3 = 54/36 - Subtract the two like fractions:
80/36 - 54/36 = 80 - 54/36 = 26/36 - After reducing the fraction, the answer is 13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9-18/12 20/9-36/12 20/18-18/12 20/9-18/24 60/9-18/12 20/9-54/12 20/27-18/12 20/9-18/36 20/9-90/12 20/45-18/12 20/9-18/60 20/63-18/12 20/9-18/84