When young Per visits her uncle Sir Cumference and his family, she learns how to play the game, "Inners and Edges." After she finds a clue linking the game to the mysterious castle on the island of Immeter, she must figure out how to find the perimeter and area of a circle to unlock the island's secret.

Math skills taught include finding the area and perimeter of a rectangle and a circle. Introduces an underlying concept of calculus--using straight lines to measure curves. Recommended for ages 9 -12, grades 4 to 8

http://www.christianbook.com/cumference-the-isle-immeter-math-adventure/cindy-neuschwander/9781570916816/pd/709168

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