Final answer:
The first three common multiples of 3 and 4 are 12, 24, and 36, which are found by listing the multiples of each number and identifying the ones they share.
Step-by-step explanation:
To find the first three common multiples of 3 and 4, we need to list multiples of each number and then identify which ones they have in common. Multiples of 3 are 3, 6, 9, 12, 15, 18, and so on, while multiples of 4 are 4, 8, 12, 16, 20, 24, etc. Looking at these multiples, we can see that the number 12 appears in both lists. As we continue, we find that the next common multiple is 24, found in both sequences. Following that, the next common multiple is 36. Therefore, the first three common multiples of 3 and 4 are 12, 24, and 36.