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.

Polly's got a pen pal ... in Canada! Polly's sure that she and her new friend, Ally, will have a lot in common. When Ally writes that she's 125 centimeters tall and weighs 25 kilograms, Polly wants to know if she's the same. Polly wishes she could go and visit her -- but Ally lives 450 kilometers away! Young readers will learn about metric units like centimeters, kilograms, kilometers, and liters as they follow this story of two friends who can't be kept apart.

As Zero searches to find his place, he learns of his additive and multiplicative identities, and then he establishes place value.

It's the last week of Camp Grizzly, and the campers are preparing to elect a mascot. Each day the Grizzly Gazette takes a poll to see who has the biggest percentage of the vote so far. Is it Sophie? Is it Daniel? Or could it be Corey, the new entry in the race? Corey's determined to do her best. But she's got to make up for lost time. Can she win out over Daniel and Sophie? No one will know for sure until the last vote is counted! A lively story about summer camp fun will help young readers understand both percentage and voting!

Max makes fun of Freda's shoes, but Freda soon learns how to cope with his bullying.

Carlos learns the importance of washing his hands.