Answer:
36
Step-by-step explanation:
The least common denominator is 36. As we can see for the multiples of 12:
12 24 36 48 ...
and the multiples of 9:
9 18 27 36 45 ...
You can also do this by prime factorization:
12=2*2*3
9=3*3
therefore the lcd must be 2*2*3*3=36
