David A Adler

Cam uses her photographic memory and her brain to solve two mysteries at the beach, involving a missing mother and a missing set of papers.

Cam helps her friend Eric when he misplaces his permission slip to go on the school field trip.

Fifth-grade sleuth Cam Jansen uses her photographic memory to catch a thief during a department store sale.

"Cesar Chavez dedicated his life to helping American farmworkers. As a child growing up in California during the Great Depression, he picked produce with his family. Cesar saw firsthand how unfairly workers were treated. As an adult, he organized farmworkers into unions and argued for better pay and fair working conditions. He was jailed for his efforts, but he never stopped urging people to stand up for their rights."--Amazon.com.

Calvin Waffle doesn't believe in bad ideas Danny knows his friend Calvin has crazy ideas, so he's not surprised when Calvin suggests they start a Rent-a-Pet business. After all, Calvin's Aunt Ruth wants the boys to watch her dog while she's away, and what better way to get the miniature Collie off their hands than loaning him to a kid in the neighborhood for a few days? But in order to rent a pet, you need a renter. Which Calvin and Danny don't have....

"An apple floats in a tub of water, but a ball of aluminum foil sinks to the bottom. But wait. If that same ball of foil is flattened out and shaped into a boat, it floats! How can that be? David A. Adler's clear, concise text and Anna Raff's delightful illustrations explain the basic principles of flotation and density in a way that will really sink in"--Front dust jacket flap.

A basic introduction to the concept of fractions.

Eric's Grandma Minnie and Grandpa Max keep hearing someone knock at their door, night and day, but find no one there, so Cam tries to solve the mystery using her amazing memory.

Cam Jansen, with Eric at her side, helps solve the mystery of what happened to Mr. Day's tennis trophy.

Introduces the seven symbols and their values, shows how to add and subtract to make numbers. Teaches how the symbols interact and about the bar across the top and the open box that are used for larger numbers. Shows Roman numerals in real life settings: on clocks, in books, and on buildings.