Subtract 4/81 from 21/6
1st number: 3 3/6, 2nd number: 4/81
21/6 - 4/81 is 559/162.
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,
4/81 = 4 × 2/81 × 2 = 8/162 - Subtract the two like fractions:
567/162 - 8/162 = 567 - 8/162 = 559/162 - In mixed form: 373/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-4/81 21/6-8/81 21/12-4/81 63/6-4/81 21/6-12/81 21/18-4/81 21/6-20/81 21/30-4/81 21/6-28/81 21/42-4/81