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How tall is the pyramid?

6th GradeRatiosabout 2 minCCSS 6.RP.A.3.aCCSS 7.RP.A.2.a

Measure a pyramid from its shadow. Then shrink the Sun to a beach ball.

Lesson Plan

Use tables of equivalent ratios to find an unknown height from a known one.

  1. Question: Ask what students spot and what they are curious about. Read “How long is the pyramid's shadow?” aloud. Have each student guess and say why.

  2. Big idea: Pause. Ask a student to say the idea in their own words.

  3. Question: Read “How big is Earth, at this scale?” aloud. Have partners explain their guesses to each other.

  4. Real-world application: Ask: Where else have you seen this?

  5. Your turn: Have students try their own. Ask them to predict before they test.

How to run it

  1. Whole classPut the lesson on the board. At each choice the class votes, then you select the winner.
  2. SoloShare the link, QR code, or post to Google Classroom. Each student gets to take their own path.