Algebraic Expressions Lesson 6 Episode 2 (Teachers)


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The students apply Nicole’s method for finding the total number of gray cobblestones for a new Size Number.

Episode Supports

Focus Questions

For use in a classroom, pause the video and ask these questions:

  1. [Pause the video at 1:40] Ask students what they think ET and Haleemah mean when they talk about drawing rows versus columns. Follow up by asking if they think it matters which way they approach the problem and why.
  2. [Pause the video at 3:37] Haleemah says she drew five rows of five stones for the first and third sections and then five groups of six stones for the second section. ET says that for the first and third sections, he drew five columns, each with five stones, and for the middle section he drew six columns, each with five stones. Ask your students to pick one of these descriptions and link it to the expression 52 + 5(5 + 1) + 52

Supporting Dialogue

In this video, ET uses the phrase “five squared” when discussing the expression 52. Ask your students to think about connections between the three representations for this mathematical idea: (a) the verbal representation “five squared”; (b) the symbolic representation 52; and (c) the visual representation shown in the videos in the first and third sections, namely an array of gray stones with five columns, each with five stones.