I've always had good success with using dominos to show kids how they could estimate which domino had more, fewer, or the same number of dots. This works with my kindergarten class and we sometimes work on getting the dominos in order in terms of how many dots they have and then we'll knock them down.
Using Dominos to help kids learn how to estimate and compare
K - Kindergarten

1 - First Grade

2 - Second Grade
        
3 - Third Grade
                  
4 - Fourth Grade
        
5 - Fifth Grade

The grade level links above will take you to the Sunshine State Standards math expectations. Each expectation also includes a printable student activity.
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