Subtract 9/20 from 1/9
1/9 - 9/20 is -61/180.
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,
1/9 = 1 × 20/9 × 20 = 20/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
9/20 = 9 × 9/20 × 9 = 81/180 - Subtract the two like fractions:
20/180 - 81/180 = 20 - 81/180 = -61/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/9-9/20 1/9-18/20 1/18-9/20 1/9-9/40 3/9-9/20 1/9-27/20 1/27-9/20 1/9-9/60 5/9-9/20 1/9-45/20 1/45-9/20 7/9-9/20 1/9-63/20 1/63-9/20