Download or read book Less Than Zero written by Stuart J. Murphy and published by Harper Collins. This book was released on 2003-08-14 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.