They are: 9, 18, 27, 36, and 45
They are: 15, 30 and 45
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They are all multiples of 3.
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, and so on. Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, adn so on. The common multiples of 3 and 5 are all of the multiples of 15, i.e. 15, 30, 45, 60, 75, 90, and so on.
Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30. 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.