Here is a great resource for teaching problem solving and two dimensional mathematics. It also has a cute story about the relationship between a grandfather and a granddaughter.
It is called Grandfather Tang's Story. If you click on the link you will find activities to do that are related to the story.
Grandfather Tang uses a series of puzzles, called Tangrams, to tell his story. You can play with these on line by going to the following link. PBS kids has a neat version too on their Cyberchase site. Click here.
Tangrams are seven piece puzzles that were initially developped in China. Read the article from Wikipedia to learn more about these versatile puzzles.
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