Add 80/21 and 21/27
1st number: 3 17/21, 2nd number: 21/27
80/21 + 21/27 is 289/63.
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,
80/21 = 80 × 9/21 × 9 = 720/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
21/27 = 21 × 7/27 × 7 = 147/189 - Add the two like fractions:
720/189 + 147/189 = 720 + 147/189 = 867/189 - 867/189 simplified gives 289/63
- So, 80/21 + 21/27 = 289/63
In mixed form: 437/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+42/27 80/42+21/27 80/21+21/54 80/21+63/27 80/63+21/27 80/21+21/81