Ten Frame Math Manipulative

This is a ten frame math manipulative used to help visualize numbers. My son's first grade math uses pictures of these to help show relation of numbers to 10. Here's some info on ten frames if you didn't use them to learn your numbers (I didn't understand the point at first, but this paper helps explain its purpose)
http://www.region10ct.org/math/region10mathsitefaq/What%20is%20a%20Ten%20Frame.pdf