Add 8/21 and 9/27
8/21 + 9/27 is 5/7.
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,
8/21 = 8 × 9/21 × 9 = 72/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
9/27 = 9 × 7/27 × 7 = 63/189 - Add the two like fractions:
72/189 + 63/189 = 72 + 63/189 = 135/189 - 135/189 simplified gives 5/7
- So, 8/21 + 9/27 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+9/27 8/21+18/27 8/42+9/27 8/21+9/54 24/21+9/27 8/63+9/27 8/21+9/81 40/21+9/27 8/21+45/27 56/21+9/27 8/21+63/27