Subtract 18/81 from 20/3
1st number: 6 2/3, 2nd number: 18/81
20/3 - 18/81 is 58/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 3 × 27 = 81,
20/3 = 20 × 27/3 × 27 = 540/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
18/81 = 18 × 1/81 × 1 = 18/81 - Subtract the two like fractions:
540/81 - 18/81 = 540 - 18/81 = 522/81 - After reducing the fraction, the answer is 58/9
- In mixed form: 64/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3-18/81 20/3-36/81 20/6-18/81 60/3-18/81 20/3-54/81 20/9-18/81 20/3-90/81 20/15-18/81 20/21-18/81