Description
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.
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.