The Code Book: The Secrets Behind Codebreaking
November 8, 2017
Halloween Stories: Spooky Short Stories for Children (Halloween Short Stories for Kids) (Volume 4)
November 8, 2017

Price: [price_with_discount]


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.


Comments are closed.