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