Lesson 63 Learning Objectives:
Use square centimeters and square meters to measure the areas of regular and irregular shapes
Determine appropriate units for measuring area
Derive the formula for the area of a rectangle, express the formula using variables, and use it to calculate the areas of rectangles
Find areas of irregular polygons by decomposing them into rectangles
Practice:
Jump Math 4.2:
Pages 92-97
Reflect:
Reflect in your math journal. Draw, create or write to share your thinking. See Lesson guide 63 for more reflection questions, real life anchoring, playful explorations and creative invitations.
Two shapes have the same area, but one is a rectangle and one is an L-shape. Can they really be the same?
If you doubled the length of a rectangle but not the width, what happens to the area?
Which tool for finding area—grid, formula, or decomposition—felt most helpful?
When calculating the area of a space, how can dividing it into parts help to understand the whole?
Math Talk:
Have a conversation about this image. Be curious. Be creative. Can you see in different ways?
Which shape doesn't belong?
What space and shape do you notice? What colours and patterns do you see? What can you measure? If these shapes were floorplans, what might the rooms look and feel like? What size would they be?
