Subtract 30/24 from 21/27
1st number: 21/27, 2nd number: 1 6/24
21/27 - 30/24 is -17/36.
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,
21/27 = 21 × 8/27 × 8 = 168/216 - Likewise, for the 2nd fraction, since 24 × 9 = 216,
30/24 = 30 × 9/24 × 9 = 270/216 - Subtract the two like fractions:
168/216 - 270/216 = 168 - 270/216 = -102/216 - After reducing the fraction, the answer is -17/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-30/24 21/27-60/24 21/54-30/24 21/27-30/48 63/27-30/24 21/27-90/24 21/81-30/24 21/27-30/72