Area of Rectangles with Geoboard

Create a rectangle with a length of 5 units and width of 3 units. Place unit squares along the length and notice that 5 unit squares fit along a length of 5 units. Next, place rows of 5 unit squares along the width and notice that 3 rows of 5 unit squares fit along a width of 3 units. The rectangle has an area of 5 + 5 + 5 square units, or 5 × 3 square units, or 15 square units. To find the area of any rectangle, multiply the length ℓ by the width w. So a rectangle with a length of 3 units and width of 6 units has an area of 3 × 6, or 18 square units. You can confirm the formula works by counting the number of unit squares inside the figure.

Area of Rectangles using the Brainingcamp Geoboard virtual manipulative.

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Brainingcamp virtual manipulatives can be used anywhere with no setup, cleanup, or lost parts. They are highly effective at engaging today’s digital learners and helping them bringing abstract math concepts to life.


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