In this video, zookeeper Lisa Murphy of the Phoenix Zoo explains how she uses math in her work with birds. In the accompanying classroom activity, students engage in an estimation activity based on one of the aspects of math that Ms. Murphy discusses: they use the number of objects in a small group to estimate how many there are in a much larger group. To get the most from the lesson, students should have some familiarity with volume.

This resource is part of the Math at the Core: Middle School collection.

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