Subtract 18/24 from 21/9
1st number: 2 3/9, 2nd number: 18/24
21/9 - 18/24 is 19/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 24 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
21/9 = 21 × 8/9 × 8 = 168/72 - Likewise, for the 2nd fraction, since 24 × 3 = 72,
18/24 = 18 × 3/24 × 3 = 54/72 - Subtract the two like fractions:
168/72 - 54/72 = 168 - 54/72 = 114/72 - After reducing the fraction, the answer is 19/12
- In mixed form: 17/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9-18/24 21/9-36/24 21/18-18/24 21/9-18/48 63/9-18/24 21/9-54/24 21/27-18/24 21/9-18/72 21/9-90/24 21/45-18/24 21/63-18/24