Collaborate and Reflect
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Weekly Checklist File
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Give a lesson, take a lesson...
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Extend Your Understanding
Watch the video excerpt below to view an example of a teacher engaging students in using appropriate tools strategically.
Cathy Humphreys leads an extended exploration of a proof of the properties of quadrilaterals, helping students learn to investigate, formulate, conjecture, justify, and ultimately prove mathematical theorems. In this clip, Humphreys circulates around groups of students as they use rulers, protractors, and sheets of paper to make different kinds of quadrilaterals and examine and “guarantee” their properties. A group of students debates whether or not one student’s assertion about the properties of a trapezoid hold in all circumstances, using the kite “sticks” to illustrate their points. 9th/10th grade first video This clip is also indicative of Mathematical Practice 1.