This little contraption is a hardware store purchase. It's a PVC plumbing elbow with a drain and screw-on drain cap. The idea is to show children that combining sets of objects creates a new set. For example, in one hand you have 3 red beads and in the other 2 blue beads. If you drop them in either side at the same time, they combine to make a new set of 5. Remove from the cup and count. Practice with different objects and amounts to show that computation doesn't have to be frustration! Great for visual learners.
*Variation: Edible math, Cheerios and Kix for example...guess the number and you get to eat it.
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