Add 12/27 and 9/21
12/27 + 9/21 is 55/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
9/21 = 9 × 9/21 × 9 = 81/189 - Add the two like fractions:
84/189 + 81/189 = 84 + 81/189 = 165/189 - 165/189 simplified gives 55/63
- So, 12/27 + 9/21 = 55/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/27+9/21 12/27+18/21 12/54+9/21 12/27+9/42 36/27+9/21 12/27+27/21 12/81+9/21 12/27+9/63 60/27+9/21 12/27+45/21 84/27+9/21 12/27+63/21