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Less Than Zero
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Amazon.com Product Description (ISBN 0060001267, Paperback)
Perry the Penguin needs 9 clams to buy an ice scooter -- but he's not very good at saving. As Perry earns, spends, finds, loses, and borrows clams, a simple line graph demonstrates the concept of negative numbers.
(retrieved from Amazon Mon, 30 Sep 2013 13:38:54 -0400)
While trying to save enough money to buy a new ice scooter, Perry the Penguin learns about managing his money and about negative numbers.
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