Repeating Your Reasoning
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The students apply Amir’s method to find the number of gray stones for another Size Number and connect their calculations to the cobblestone context.
Episode Supports 
Students’ Conceptual Challenges
Focus Questions
For use in a classroom, pause the video and ask these questions:
1. [Pause video at x:xxx]. text
Supporting Dialogue
Focus students’ attention on conjecturing and providing evidence for their conjectures:
1. Example