A fun and easy activity introducing multiplication relating to repeated addition. You will need snap cubes, cups, and marbles.
You can do the first example together to build the tower using snap cubes and ask them to do the next one and the back side filling cups with marbles.
You can discuss when they are done how it's repeated addition (you can even draw plus signs between each picture of towers and cups) and making groups both ways gives you the same answer.
You will need 11x17 paper to do this so they can draw. They can use crayons or just draw with pencil!