Subtract 8/9 from 21/27
21/27 - 8/9 is -1/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 9 is 27
Next, find the equivalent fraction of both fractional numbers with denominator 27 - For the 1st fraction, since 27 × 1 = 27,
21/27 = 21 × 1/27 × 1 = 21/27 - Likewise, for the 2nd fraction, since 9 × 3 = 27,
8/9 = 8 × 3/9 × 3 = 24/27 - Subtract the two like fractions:
21/27 - 24/27 = 21 - 24/27 = -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: 42/27-8/9 21/27-16/9 21/54-8/9 21/27-8/18 63/27-8/9 21/27-24/9 21/81-8/9 21/27-8/27 21/27-40/9 21/27-8/45 21/27-56/9 21/27-8/63