Subtract 21/27 from 15/24
15/24 - 21/27 is -11/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 27 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 24 × 9 = 216,
15/24 = 15 × 9/24 × 9 = 135/216 - Likewise, for the 2nd fraction, since 27 × 8 = 216,
21/27 = 21 × 8/27 × 8 = 168/216 - Subtract the two like fractions:
135/216 - 168/216 = 135 - 168/216 = -33/216 - After reducing the fraction, the answer is -11/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/24-21/27 15/24-42/27 15/48-21/27 15/24-21/54 45/24-21/27 15/24-63/27 15/72-21/27 15/24-21/81 75/24-21/27