## 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

# Area of Composite Shapes Using a Grid

Unit 6: Geometry
Lesson 3 of 37

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

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Standards:
Subject(s):
Math, areas, Geometry, Rectilinear, composite shapes, perimeter, Diameter
50 minutes

### Grant Harris

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