Teaching Math: Grades 6-8: Reasoning and Proof


	Observing Student Reasoning and Proof


	Introduction \| Problem: Building Rafts with Rods \| Solution: Building Rafts with Rods \| Student Work #1 \| Questions and Answers #1 \| Student Work Reflection #1 \| Student Work #2 \| Questions and Answers #2 \| Student Work Reflection #2 \| Observe Classroom \| Classroom Practice \| Your Journal

Evan was working with the yellow rod. The dimensions of one yellow rod are 5 cm by 1 cm by 1 cm:

Evan made this table:

He noticed that every time he added a yellow rod to the raft, he increased the surface area by 12 square centimeters, but he couldn't figure out how to translate this fact into a rule.

Consider some questions you might ask Evan




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