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)
Play games
https://www.esparklearning.com/activities/math/panda-breakout-least-common-multiples
https://www.sheppardsoftware.com/math/multiples/fruit-splat-game/