Reflection: Problem-based Approaches Area of Composite Shapes Using a Grid - Section 1: Opening


In the resource, I specified how I wanted students to solve problem GP3 and GP4.  You will see that they are the exact same shape but that I have asked students to subdivide them into specific ways.  Some students completely ignored or misunderstood what I wrote and came up with a third and equally valid subdivision.  This one included a trapezoid and a triangle.  

I think in the future, I may launch the lesson with this particular problem.  I will remove any suggestions as to how to subdivide the shape.  Then, I'll give students about 5 minutes to come up with their own solution before sharing with a partner or a group.  Instead of receiving guidance from me, the various ways to solve the problem will be student generated. 

  Variations on a Shape
  Problem-based Approaches: Variations on a Shape
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Area of Composite Shapes Using a Grid

Unit 6: Geometry
Lesson 3 of 37

Objective: SWBAT find the area of composite shapes (on a grid) by finding the sum of the areas of its component shapes using area formulas

Big Idea: Students find the area of shapes using grid paper and markers.

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19 teachers like this lesson
Math, areas, Geometry, Rectilinear, composite shapes, perimeter, Diameter
  50 minutes
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