Stuart J Murphy

While trying to save enough money to buy a new ice scooter, Perry the Penguin learns about managing his money and about 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...

Teaches division as a group of friends goes on different carnival rides.

As Maddie cleans up her room, she learns how to compare the weights of various objects.

As Birdie and his friends try to locate a house that is just right for his size, readers learn about the concept of capacity.

Introduces pattern recognition as a sock searches the house for its lost mate.

When the 21st Street Sluggers, a baseball team, have a car wash to raise money, they learn to keep careful track of their dollars and cents.

Explains the concept of subtraction through a rhyming text about a descending elevator.