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.
- ISBN10 0060001267
- ISBN13 9780060001261
- Publish Date 20 April 2016 (first published 14 August 2003)
- Publish Status Active
- Publish Country US
- Publisher HarperCollins Publishers Inc
- Imprint HarperCollins
- Format Paperback
- Pages 40
- Language English