Mathematical Thinking can be seen as a task, enrichment, or a starter in the classroom. Regardless, it is a problem that makes students think while supporting the CCSS standard listed utilizing the Mathematical Practices.
This Mathematical Thinker poses the problem of comparing planets and moon by their radius to determine the ranked order. Students find it interesting when moons are bigger than some planets.
This thinker is designed to go with Grade 4 EnVision Topic 3 lesson 4 but will work with any lesson instructing towards 4.NBT.2.