About this 3D model

Model expressions and equations on a number line with positive and negative jumps. Print out positive and negative jumps, and then place them standing up on the number line to build expressions. Create two expressions that both start at zero and end at the same place to form an equation. This is a powerful hands-on modeling tool to help students bridge the gap between modeling situations and symbolic representations. Teachers: I've included two worksheets (pdf files) that students can use use along with this manipulative. The worksheets include examples of how to use the tool. Here are the Common Core standards associated with this manipulative: K.OA.2, 1.OA.1, K.OA.2 2.MD.6, 6.NS.5 and 6.NS.6, 6.EE.2 and 6.EE.6 I've include the SketchUp source files (in the zip archive).