Subtract 21/27 from 1/9
1/9 - 21/27 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 27 is 27
Next, find the equivalent fraction of both fractional numbers with denominator 27 - For the 1st fraction, since 9 × 3 = 27,
1/9 = 1 × 3/9 × 3 = 3/27 - Likewise, for the 2nd fraction, since 27 × 1 = 27,
21/27 = 21 × 1/27 × 1 = 21/27 - Subtract the two like fractions:
3/27 - 21/27 = 3 - 21/27 = -18/27 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/9-21/27 1/9-42/27 1/18-21/27 1/9-21/54 3/9-21/27 1/9-63/27 1/27-21/27 1/9-21/81 5/9-21/27 1/45-21/27 7/9-21/27 1/63-21/27