Add 15/21 and 15/27
15/21 + 15/27 is 80/63.
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,
15/21 = 15 × 9/21 × 9 = 135/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
15/27 = 15 × 7/27 × 7 = 105/189 - Add the two like fractions:
135/189 + 105/189 = 135 + 105/189 = 240/189 - 240/189 simplified gives 80/63
- So, 15/21 + 15/27 = 80/63
In mixed form: 117/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+15/27 15/21+30/27 15/42+15/27 15/21+15/54 45/21+15/27 15/21+45/27 15/63+15/27 15/21+15/81 75/21+15/27 15/21+75/27