Add 27/28 and 84/81
1st number: 27/28, 2nd number: 1 3/81
27/28 + 84/81 is 1513/756.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 28 × 81 = 2268,
27/28 = 27 × 81/28 × 81 = 2187/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
84/81 = 84 × 28/81 × 28 = 2352/2268 - Add the two like fractions:
2187/2268 + 2352/2268 = 2187 + 2352/2268 = 4539/2268 - 4539/2268 simplified gives 1513/756
- So, 27/28 + 84/81 = 1513/756
In mixed form: 21/756
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/28+84/81 27/56+84/81 81/28+84/81 27/84+84/81