Subtract 24/9 from 21/12
1st number: 1 9/12, 2nd number: 2 6/9
21/12 - 24/9 is -11/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
24/9 = 24 × 4/9 × 4 = 96/36 - Subtract the two like fractions:
63/36 - 96/36 = 63 - 96/36 = -33/36 - After reducing the fraction, the answer is -11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-24/9 21/12-48/9 21/24-24/9 21/12-24/18 63/12-24/9 21/12-72/9 21/36-24/9 21/12-24/27 21/60-24/9 21/12-24/45 21/84-24/9 21/12-24/63