Subtract 21/27 from 6/18
6/18 - 21/27 is -4/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 27 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
6/18 = 6 × 3/18 × 3 = 18/54 - Likewise, for the 2nd fraction, since 27 × 2 = 54,
21/27 = 21 × 2/27 × 2 = 42/54 - Subtract the two like fractions:
18/54 - 42/54 = 18 - 42/54 = -24/54 - After reducing the fraction, the answer is -4/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/18-21/27 6/18-42/27 6/36-21/27 6/18-21/54 6/18-63/27 6/54-21/27 6/18-21/81 30/18-21/27 6/90-21/27 42/18-21/27