Mastering Perimeter Calculations for 3rd Graders

This video tutorial from Kids Academy explains how to calculate the perimeter of various shapes, including rectangles, triangles, and squares. It introduces the concept of perimeter as the total distance around a shape and demonstrates different strategies for calculating it, such as using doubles and friendly numbers. The video provides step-by-step examples for each shape and concludes with tips for simplifying perimeter problems.

What is the perimeter?

• The distance around a shape

• The volume of a shape

• The area inside a shape

• The length of one side of a shape

How do you calculate the perimeter of a rectangle?

• Divide the total length by the number of sides

• Multiply the length by the width

• Add the length of all sides

• Subtract the shorter side from the longer side

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CCSS.4.MD.A.3

What is the perimeter of a rectangle with sides 2 inches and 3 inches?

• 12 inches

• 10 inches

• 8 inches

• 6 inches

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CCSS.4.MD.A.3

What strategy is used to find the perimeter of a rectangle in the video?

• Multiplying all sides

• Adding the doubles first

• Dividing each side by two

• Subtracting the smallest side from the total

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CCSS.4.MD.A.3

What is the perimeter of a triangle with each side measuring 4 inches?

• 16 inches

• 8 inches

• 10 inches

• 12 inches

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CCSS.3.MD.D.8

How can making your work easier help in finding the perimeter?

• By skipping steps

• By guessing the answer

• By using a calculator

• By creating two simpler problems

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CCSS.3.MD.D.8

What is the perimeter of a square with each side measuring 6 inches?

• 12 inches

• 30 inches

• 24 inches

• 18 inches

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CCSS.4.MD.A.3

What is another method mentioned for finding the perimeter of a rectangle?

• Halving each side

• Multiplying all sides by two

• Doubling the longest side

• Using friendly numbers

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CCSS.4.MD.A.3

What is the perimeter of a rectangle with sides 7 inches and 3 inches using friendly numbers?

• 28 inches

• 14 inches

• 20 inches

• 10 inches

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CCSS.4.MD.A.3

Why is it helpful to break down perimeter problems into simpler parts?

• To make calculations easier

• To use less paper

• To impress friends

• To avoid using a calculator