Add 21/27 and 28/7
1st number: 21/27, 2nd number: 4 0/7
21/27 + 28/7 is 43/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
21/27 = 21 × 7/27 × 7 = 147/189 - Likewise, for the 2nd fraction, since 7 × 27 = 189,
28/7 = 28 × 27/7 × 27 = 756/189 - Add the two like fractions:
147/189 + 756/189 = 147 + 756/189 = 903/189 - 903/189 simplified gives 43/9
- So, 21/27 + 28/7 = 43/9
In mixed form: 47/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27+28/7 21/27+56/7 21/54+28/7 21/27+28/14 63/27+28/7 21/27+84/7 21/81+28/7 21/27+28/21 21/27+28/35 21/27+28/49