Add 18/27 and 63/21
1st number: 18/27, 2nd number: 3 0/21
18/27 + 63/21 is 11/3.
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,
18/27 = 18 × 7/27 × 7 = 126/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
63/21 = 63 × 9/21 × 9 = 567/189 - Add the two like fractions:
126/189 + 567/189 = 126 + 567/189 = 693/189 - 693/189 simplified gives 11/3
- So, 18/27 + 63/21 = 11/3
In mixed form: 32/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27+63/21 18/54+63/21 18/27+63/42 54/27+63/21 18/81+63/21 90/27+63/21