Subtract 20/18 from 18/9
1st number: 2 0/9, 2nd number: 1 2/18
18/9 - 20/18 is 8/9.
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,
18/9 = 18 × 2/9 × 2 = 36/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
20/18 = 20 × 1/18 × 1 = 20/18 - Subtract the two like fractions:
36/18 - 20/18 = 36 - 20/18 = 16/18 - After reducing the fraction, the answer is 8/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9-20/18 18/9-40/18 18/9-20/36 54/9-20/18 18/9-60/18 18/27-20/18 18/9-20/54 90/9-20/18 18/45-20/18 18/9-20/90 18/63-20/18