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. Stuart shows kids that they use math every day—to share a pizza;spend their allowance;and even sort socks. And kids start to see the fun in math!
1.OA.D.7 Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.