Discusses young Per taking a mathmatical adventure.

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In an adventurous title that teaches math skills such as finding the area and perimeter of a rectangle and a circle, young Per must figure out how to unlock the secrets of the mysterious island of Immeter. Simultaneous.

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Per and her cousin, Radius, solve the mystery of the Isle of Immiter by finding the area and perimeter of different geometric shapes.

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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.

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