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10.06 Find areas using a grid

Lesson

Are you ready?

Let's try this problem to review how to compare the area of shapes. 

The area of two tabletops were measured by laying out newspaper sheets over them.

Victoria’s table needed $6$6 sheets of paper, and Peter’s table needed $3$3 sheets of paper.

Whose table has the smallest area?

  1. Victoria's table

    A

    Peter's table

    B

Learn

We can measure area in shapes such as squares and rectangles, but what about different shapes? 

To help us measure the area of shapes like the ones pictured below, we can use square units.

In this video, we look at how to calculate the area of shapes similar to those in the picture shown.

Apply

question 1

Find the area of the shape by counting the number of grid squares it covers.

Each grid square represents $1$1 square unit.

 

Learn

Sometimes we have unusual shapes but we can still work out the area of these shapes by counting the number of square units inside. We can also work out the area of triangles! 

Apply

question 2

Find the area of the shape by counting the number of grid squares it covers.

Each grid square represents $1$1 square unit.

 

question 3

Find the area of the shape.

  1. $\editable{}$ units2

 

Remember!

To find the amount of space a shape takes up, we can use a grid to count the number of unit squares that it covers. 

Outcomes

3.MD.5

Recognize area as an attribute of plane figures and understand concepts of area measurement.

3.MD.5.a

A square with side length one unit, called "a unit square," is said to have "one square unit" of area, and can be used to measure area.

3.MD.5.b

A plane figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.

3.MD.6

Measure areas by counting unit squares (square centimeters, square meters, square inches, square feet).

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