Materials: Dropper, Paper with circles of different sizes drawn on it, Cups filled with different colors of water
Have children guess as they drop water in each circle of how many drops it will take to fill it, count with children as they drop the water. Let them guess what would happen if you mixed colors and see how many colors they can come up with. Talk about the different sizes of circles and did it take more or less to fill up the small circles and so on.