Subtract 21/24 from 15/27
15/27 - 21/24 is -23/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 24 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 27 × 8 = 216,
15/27 = 15 × 8/27 × 8 = 120/216 - Likewise, for the 2nd fraction, since 24 × 9 = 216,
21/24 = 21 × 9/24 × 9 = 189/216 - Subtract the two like fractions:
120/216 - 189/216 = 120 - 189/216 = -69/216 - After reducing the fraction, the answer is -23/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/27-21/24 15/27-42/24 15/54-21/24 15/27-21/48 45/27-21/24 15/27-63/24 15/81-21/24 15/27-21/72 75/27-21/24