Add 27/21 and 28/27
1st number: 1 6/21, 2nd number: 1 1/27
27/21 + 28/27 is 439/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
27/21 = 27 × 9/21 × 9 = 243/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
28/27 = 28 × 7/27 × 7 = 196/189 - Add the two like fractions:
243/189 + 196/189 = 243 + 196/189 = 439/189 - So, 27/21 + 28/27 = 439/189
In mixed form: 261/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21+28/27 27/21+56/27 27/42+28/27 27/21+28/54 81/21+28/27 27/21+84/27 27/63+28/27 27/21+28/81