Subtract 20/12 from 18/9
1st number: 2 0/9, 2nd number: 1 8/12
18/9 - 20/12 is 1/3.
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,
18/9 = 18 × 4/9 × 4 = 72/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
20/12 = 20 × 3/12 × 3 = 60/36 - Subtract the two like fractions:
72/36 - 60/36 = 72 - 60/36 = 12/36 - After reducing the fraction, the answer is 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9-20/12 18/9-40/12 18/9-20/24 54/9-20/12 18/9-60/12 18/27-20/12 18/9-20/36 90/9-20/12 18/45-20/12 18/9-20/60 18/63-20/12 18/9-20/84