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How did a crowd flatten the Golden Gate Bridge?

Algebra 1Equations and inequalitiesabout 3 minCCSS HSA.CED.A.1CCSS HSA.CED.A.3

Weigh a crowd against a car, then find how many people a bridge or an elevator can safely carry.

Lesson Plan

Write and solve linear inequalities to model a weight limit.

  1. Question: Ask what students spot and what they are curious about. Read “Which is heavier, car or people?” aloud. Have each student guess and say why.

  2. Question: Read “How many grown-ups can ride?” aloud. Have partners explain their guesses to each other.

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

  4. Big idea: Pause. Have partners explain the idea to each other.

  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.