Subtract 21/6 from 81/12
1st number: 6 9/12, 2nd number: 3 3/6
81/12 - 21/6 is 13/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 6 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 12 × 1 = 12,
81/12 = 81 × 1/12 × 1 = 81/12 - Likewise, for the 2nd fraction, since 6 × 2 = 12,
21/6 = 21 × 2/6 × 2 = 42/12 - Subtract the two like fractions:
81/12 - 42/12 = 81 - 42/12 = 39/12 - After reducing the fraction, the answer is 13/4
- In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12-42/6 81/24-21/6 81/12-21/12 81/12-63/6 81/36-21/6 81/12-21/18 81/60-21/6 81/12-21/30 81/84-21/6 81/12-21/42