Powerful tools for mathematics instruction can make a good lesson great. Math tools in action: manipulatives make mathematics visible; they allow students to see math. Manipulatives also enrich mathematics discussions and make learning accessible and understandable for students at all levels. In this video, Chris and a year three class learn about comparative size by exploring the dimensions of a variety of insects, animals and birds using tape measures, linking cubes and number charts. For more than twenty years, Chris Confer and Marco Ramirez have worked with administrators and teachers at dozens of schools to cultivate an environment that elevates math instruction school-wide. Now you can watch as they teach and comment on a complete lesson using these essential math tools - tools that will help you deepen and improve your own math instruction, no matter what grade level you teach. About the author: Chris Confer has a passion for both mathematics and teaching children. Chris has authored five other books on teaching mathematics and being a mathematics coach, and she has created a popular number-assessment tool that helps guide instruction. Marco Ramirez is an award-winning educator who has successfully transformed schools using mathematics as leverage for change. Marco's work is practical and rooted in the classroom. He has taught multiple grade levels and has won the Milken Educator of the Year award as a principal.