Module 11: Perimeter 3rd

Manny is cutting rectangular slate tiles for a walkway. A tile has side lengths of 8 inches and 6 inches.

Find the perimeter of a tile.

• 28

• 14

• 22

• 38

• 76

• 40

Kat and Jim each find the perimeter of the classroom door window. Kat says the perimeter is 30 inches, and Jim says the perimeter is 60 inches.

Who is correct and why?

Show Hint

• Kat, because Jim was supposed to multiply the sides.

• Jim, because Kat added only two sides instead of all four sides.

• Jim, because Kat said the perimeter of a rectangle is always half of its area.

• Kat, because Jim was supposed to add two side lengths and then multiply that sum by 4.

The width of a rectangle is 9 centimeters. The length is 3 centimeters.

What is the perimeter of the rectangle?

• 12 centimeters

• 15 centimeters

• 24 centimeters

• 27 centimeters

Erin is putting a fence around her square garden. Each side of her garden is 5 meters long. The fence costs $4 for each meter.

How much will the fence cost?

• 20

• 80

• 100

• 16

Li’s rectangular pencil box has side lengths of 4 inches and 9 inches. What is the perimeter of Li’s pencil box?

• 13 inches

• 22 inches

• 36 inches

• 26 inches

Isabel makes a rectangular drawing on paper. The rectangle has side lengths of 3 inches and 5 inches.

What length of yarn does Isabel need to make a border around the edge of her drawing?

• 9

• 16

• 10

Tracie has a rectangular rug. Click on the description of how to find the perimeter of the rug.

• Measure the length of each side of the rectangle. Then add the lengths of the sides.

• Measure the lengths of two opposite sides of the rectangle. Then add the lengths of those sides.

• Measure the length of one side of the rectangle and the width of the other side of the rectangle. Then add the lengths of those sides.

• Measure the length of one side of the rectangle and the width of the other side of the rectangle. Then multiply those two lengths.

Then find the sum.

384+263=

• 647

• 657

• 567

Which multiplication equation could be used to solve the division problem?

12÷6=□

• 12×□=6

• 6×□ =12

• 12×6=□

• 12×1=□