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Frosting the Edges: Perimeter at the Cookie Shop worksheet preview

Worksheet

Frosting the Edges: Perimeter at the Cookie Shop

Grade 3 perimeter practice at a cookie shop: add side lengths of polygons, find missing sides, and fix a common perimeter mistake.

Grade 3MathInteractive · Printable

Aligned to3.MD.D.8

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What’s included

  • Single worksheet
  • Auto-graded online
  • 1 Common Core standard
  • Printable answer key
  • 12 questions
  • Classroom-ready

Details

Format
Interactive · Printable
Grade
Grade 3
Subject
Math
Question types
Fill in the blank, Multiple choice, Sorting, Short answer

About this worksheet

What students practice

  • Students find the perimeter of polygons by adding all of the side lengths.
  • Students find an unknown side length when the perimeter is given.
  • Students compare perimeters of shapes to solve real-world problems.

How to use

Use after teaching perimeter as the distance around a shape. Encourage students to sketch each cookie and label every side before they add.

Curriculum

Common Core standard covered

3.MD.D.8

Solve problems about perimeters of polygons, including finding an unknown side length.

Preview

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Name Date

Frosting the Edges: Perimeter at the Cookie Shop

Find the distance around each cookie and cake.

Pipe the frosting

Frosting goes all the way around the edge of each treat. Find the perimeter.

1.
A triangle cookie has sides of 5 centimeters, 6 centimeters, and 7 centimeters.

5 + 6 + 7 =   centimeters

2.
A square cookie has sides that are each 8 centimeters long.

Perimeter =   centimeters

3.
A rectangle sheet cake is 12 inches long and 9 inches wide.

Perimeter =   inches

4.
A hexagon cookie has 6 sides. Each side is 4 centimeters long.

Perimeter =   centimeters

5.
A pentagon cookie has sides of 3, 5, 5, 4, and 6 centimeters.

Perimeter =   centimeters

Missing sides

Use the perimeter to find the missing side length.

6.
A triangle cookie has a perimeter of 21 centimeters. Two of its sides are 6 centimeters and 8 centimeters. How long is the third side?

The third side is   centimeters.

7.
A rectangle brownie tray has a perimeter of 30 inches. It is 9 inches long. How wide is it?

The tray is   inches wide.

8.
A square cake has a perimeter of 36 inches. How long is each side?
  • A. 18 inches
  • B. 32 inches
  • C. 9 inches
  • D. 12 inches
9.
A cookie has 4 sides. Three of its sides are 7 centimeters, 4 centimeters, and 5 centimeters. Its perimeter is 24 centimeters. How long is the fourth side?

The fourth side is   centimeters.

Cookie shop challenges

Find each perimeter. Then answer the question.

10.
Sort the cookies by perimeter. All the sides of the square, the pentagon, and the hexagon are the same length.
Square with 5 cm sidesTriangle with sides of 4 cm, 6 cm, and 7 cmRectangle 8 cm long and 3 cm wideHexagon with 3 cm sidesPentagon with 4 cm sidesRectangle 6 cm long and 3 cm wide
Perimeter less than 20 centimetersPerimeter of 20 centimeters or more
11.
Which cookie needs the most frosting around its edge?
  • A. A square with 6 cm sides
  • B. A rectangle 9 cm long and 3 cm wide
  • C. A triangle with sides of 7 cm, 8 cm, and 10 cm
  • D. A hexagon with 3 cm sides
12.
Mia frosts the edge of a rectangle cookie that is 6 centimeters long and 4 centimeters wide. She says the perimeter is 10 centimeters. What mistake did she make? What is the correct perimeter?

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