teaching resource

Unknown Side Perimeter Word Problems – Worksheet

Teach Starter Publishing
Google Slide, PDF | 1 page | Years: 5

Practise 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 maths 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 maths class.  

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

The perimeter of the coffee shop is 60 metres. The length is 18 metres. What is the width of the coffee shop?

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

An answer key is included with your download to make marking 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 word 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. 

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 Teach Starter Collaborator. 

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