Here are all 13 of them: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195
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3, 9, and 15. 6 and 18 are also multiples of 3, but are even.
72, 84 and 96
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.
The first six multiples of 3 are 3, 6, 9, 12, 15, and 18.