22521642
9780613684439
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.Murphy, Stuart J. is the author of 'Less Than Zero', published 2003 under ISBN 9780613684439 and ISBN 0613684435.
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