Common multiple

A common multiple is a multiple that is common to two or more numbers.

Examples:

The multiples of 3 are: 3, 6, 9, 12, 15, 18, … etc
The multiples of 5 are: 5, 10, 15, 20, 25, … etc

So, a common multiple of 3 and 5 is 15 (and 30, 45, etc …, as well)

 

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Play games

https://www.esparklearning.com/activities/math/panda-breakout-least-common-multiples

https://www.sheppardsoftware.com/math/multiples/fruit-splat-game/