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How do you catch a fake gold crown?

GeometryVolume and densityabout 3 minCCSS HSG.MG.A.2CCSS HSG.GMD.A.3

Catch a fake gold crown with water and a balance.

Lesson Plan

Use density and volume by displacement to tell apart two objects of equal weight.

  1. Question: Ask what students spot and what they are curious about. Read “Same weight? Which takes more space?” aloud. Have each student guess and say why.

  2. Question: Read “How much higher does the water go?” aloud. Have partners explain their guesses to each other.

  3. Question: Read “Both go under water. What does the crown do?” aloud. Ask a student who guessed differently to explain.

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

  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.