Subtract 18/20 from 2/9
2/9 - 18/20 is -61/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
2/9 = 2 × 20/9 × 20 = 40/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Subtract the two like fractions:
40/180 - 162/180 = 40 - 162/180 = -122/180 - After reducing the fraction, the answer is -61/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/9-18/20 2/9-36/20 2/18-18/20 2/9-18/40 6/9-18/20 2/9-54/20 2/27-18/20 2/9-18/60 10/9-18/20 2/9-90/20 2/45-18/20 14/9-18/20 2/63-18/20