Subtract 21/27 from 6/9
6/9 - 21/27 is -1/9.
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,
6/9 = 6 × 3/9 × 3 = 18/27 - Likewise, for the 2nd fraction, since 27 × 1 = 27,
21/27 = 21 × 1/27 × 1 = 21/27 - Subtract the two like fractions:
18/27 - 21/27 = 18 - 21/27 = -3/27 - After reducing the fraction, the answer is -1/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/9-21/27 6/9-42/27 6/18-21/27 6/9-21/54 18/9-21/27 6/9-63/27 6/27-21/27 6/9-21/81 30/9-21/27 6/45-21/27 42/9-21/27 6/63-21/27