Subtract 21/27 from 2/3
2/3 - 21/27 is -1/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 27 is 27
Next, find the equivalent fraction of both fractional numbers with denominator 27 - For the 1st fraction, since 3 × 9 = 27,
2/3 = 2 × 9/3 × 9 = 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: 4/3-21/27 2/3-42/27 2/6-21/27 2/3-21/54 6/3-21/27 2/3-63/27 2/9-21/27 2/3-21/81 10/3-21/27 2/15-21/27 14/3-21/27 2/21-21/27