Subtract 20/54 from 84/81
1st number: 1 3/81, 2nd number: 20/54
84/81 - 20/54 is 2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 54 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
84/81 = 84 × 2/81 × 2 = 168/162 - Likewise, for the 2nd fraction, since 54 × 3 = 162,
20/54 = 20 × 3/54 × 3 = 60/162 - Subtract the two like fractions:
168/162 - 60/162 = 168 - 60/162 = 108/162 - After reducing the fraction, the answer is 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81-40/54 84/81-60/54