Subtract 20/81 from 28/27
1st number: 1 1/27, 2nd number: 20/81
28/27 - 20/81 is 64/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 27 × 3 = 81,
28/27 = 28 × 3/27 × 3 = 84/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
20/81 = 20 × 1/81 × 1 = 20/81 - Subtract the two like fractions:
84/81 - 20/81 = 84 - 20/81 = 64/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/27-20/81 28/27-40/81 28/54-20/81 84/27-20/81 28/27-60/81 28/81-20/81