teaching resource

Unknown Side Perimeter Word Problems – Worksheet

Teach Starter Publishing
Google Slide, PDF | 4 pages | Grades: 3 - 4

Practice solving real-life perimeter word problems with an unknown side with this worksheet.

Unknown Side Perimeter Word Problems

How is perimeter used in our everyday lives? When we install fencing, hang wallpaper, or put up Christmas lights, perimeter is a math concept that is used all the time! If your students have learned the basics of perimeter, then this worksheet will make a great supplement to use in your math class.  

With this worksheet, students will have the opportunity to practice solving 8 perimeter problems with a missing side. Questions may include those such as: 

The perimeter of the coffee shop is 200 feet. The length is 60 feet. What is the width of the coffee shop?

Mr. Long is raking leaves. He is using a tarp with a perimeter of 48 meters. It is 14 meters long. What is the width?

An answer key is included with your download to make grading fast and easy!  

Tips for Differentiation + Scaffolding 

In addition to independent student work time, use this worksheet as an activity for:

For students who need a bit of a challenge, consider assigning one of the additional versions of this resource:

Perimeter Word Problems – Mixed Problem Types

Same Perimeter, Different Area Word Problems 

If there are students who need support, consider completing this worksheet in a 1-on-1 setting or in a small group setting. Additionally, work with students to draw a picture to solve each problem. There also is an alternate version of this resource focusing on standard perimeter problems

🖨️ Easily Download & Print

Use the dropdown icon on the Download button to choose between the PDF or editable Google Slides version of this resource. 

Because this resource includes an answer sheet, we recommend you print one copy of the entire file. Then, make photocopies of the blank worksheet for students to complete. 

To save paper, we suggest printing this 2-page worksheet double-sided.

Turn this teaching resource into a sustainable activity by printing on cardstock and slipping it into a dry-erase sleeve. Students can record their answers with a whiteboard marker, then erase and reuse them. 

Additionally, project the worksheet onto a screen and work through it as a class by having students record their answers in their notebooks. 

Get more worksheets to have handy!


This resource was created by Nicole Ellis, a teacher in New York and Teach Starter Collaborator. 

Don’t stop there! We’ve got more activities to shorten your lesson planning time:  

Image of Perimeter Worksheets

teaching resource

Perimeter Worksheets

Practice finding the perimeter of different shapes with this pair of worksheets.

Teach Starter Publishing4 pagesGrades: 3 - 5
Image of Interactive Perimeter Puzzle

teaching resource

Interactive Perimeter Puzzle

Calculate and match the perimeters of all 16 shapes on the board to reveal a perimeter puzzle mystery picture.

Teach Starter Publishing1 pageGrades: 3 - 4
Image of Perimeter Pals - Find the Perimeter Worksheet

teaching resource

Perimeter Pals - Find the Perimeter Worksheet

Practice finding the perimeter of rectangles and squares.

Teach Starter Publishing3 pagesGrade: 3

0 Comments

Write a review to help other teachers and parents like yourself. If you'd like to request a change to this resource, or report an error, select the corresponding tab above.

Login to comment