They have been around for over 5000 years helping people to move things. Wheels and axles are featured in this book. This introductory text briefly describes how they work and the different ways they are used to make work easier for people. There are color photographs that show the different wheels and axles that people use. Get to Know Simple Machines Series Interest Level: K-3 Reading Level: 3.2 ATOS Book Level: 4.7 AR Interest Level: LG AR Points: .5 AR Quiz: 130299EN Lexile Measure: 740 Lexile Code: NC (Non-Conforming Text) Guided Reading Level: N.