Perry the Penguin needs 9 clams to buy an ice scooter -- but hes not very good at saving. As Perry earns spends finds loses and borrows clams a simple line graph demonstrates the concept of negative numbers.
Perry the Penguin needs 9 clams to buy an ice scooter -- but hes not very good at saving. As Perry earns spends finds loses and borrows clams a simple line graph demonstrates the concept of negative numbers.
