Sometimes people need to measure long distances, such as a football field. At other times, they may need to measure something small, like a tiny dog. Learn about the tools needed to measure how long something is in "Length", an ALL ABOUT MEASURING book. Each book in this series helps children learn basic measuring concepts. Simple, engaging text and colorful photos help students gain a better understanding of measurement fundamentals and encourage a love of reading. Each AV2 media enhanced book is a unique combination of a printed book and exciting online content that brings the book to life. Readers can access embedded weblinks, audio and video clips, activities, and other features, such as slideshow, matching word activity, and quiz."--Back cover.