Subtract 12/81 from 21/6
1st number: 3 3/6, 2nd number: 12/81
21/6 - 12/81 is 181/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 6 × 27 = 162,
21/6 = 21 × 27/6 × 27 = 567/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
12/81 = 12 × 2/81 × 2 = 24/162 - Subtract the two like fractions:
567/162 - 24/162 = 567 - 24/162 = 543/162 - After reducing the fraction, the answer is 181/54
- In mixed form: 319/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-12/81 21/6-24/81 21/12-12/81 63/6-12/81 21/6-36/81 21/18-12/81 21/6-60/81 21/30-12/81 21/6-84/81 21/42-12/81