Subtract 1/12 from 21/9
1st number: 2 3/9, 2nd number: 1/12
21/9 - 1/12 is 9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
21/9 = 21 × 4/9 × 4 = 84/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
1/12 = 1 × 3/12 × 3 = 3/36 - Subtract the two like fractions:
84/36 - 3/36 = 84 - 3/36 = 81/36 - After reducing the fraction, the answer is 9/4
- In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9-1/12 21/9-2/12 21/18-1/12 21/9-1/24 63/9-1/12 21/9-3/12 21/27-1/12 21/9-1/36 21/9-5/12 21/45-1/12 21/9-1/60 21/9-7/12 21/63-1/12 21/9-1/84