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Bubble Wrap

by Dan Meyer


Act One

  • Dan Meyer

    Dan Meyer

    February 05, 2013

    How long will it take to pop the other squares?

  • 1.

    What's an answer you know is too high?

  • 2.

    What's an answer you know is too low?

  • Teacher note
    Ask students to write down their answers on paper first, then share them with their friends, then share them out to the group. This will, ideally, keep everyone accountable for her own guess.
  • 3.

    What are a few reasons for your guess?

Act Two

Act Three

  • VideoMedium square answer: 22m30s
  • VideoLarge square answer: 40m00s
  • Teacher note
    The crucial thing here is to draw out students who think that doubling the side of the square means doubling the time it takes to pop the area. Just because one thing doubles doesn't mean everything doubles.


  • 7.

    If a piece took an hour to pop, how large would you expect it to be?

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