LESS THAN ZERO P an ice erry the Penguin needs 9 clams to buy 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.
MONSTER MUSICAL CHAIRS E very time the music stops, one more monster is OUT! Kids won't be able to sit still for this musical introduction to subtraction at its simplest.