Your privacy choices

KiwiBee uses optional Google Analytics, Google Ads, and Meta Pixel cookies to understand adult visitors, measure completed sign-ups, and improve campaigns. Essential cookies always stay on. OpenAI’s ChatGPT Ads Pixel also measures page views and completed enquiries after advertising consent, and may use hashed contact details for matching. Privacy policy

Skip to main content

Perimeter: find the missing side length

Printable PDFScroll to explore
Perimeter: find the missing side length — free printable Grade 3 math worksheet

This worksheet provides practice in finding missing side lengths of polygons using perimeter calculations. Teachers can use it to reinforce students' understanding of perimeter concepts and develop their ability to solve for unknown values. Ideal for Grade 3 classrooms, it supports medium-difficulty perimeter problems to build confidence and problem-solving skills.

Learning objectives

  • Calculate the perimeter of various polygons by adding known side lengths.
  • Determine the missing side length when given the total perimeter and other side lengths.
  • Apply problem-solving skills to find unknown measurements in perimeter problems.

How to use this worksheet

  1. Select “Sign in / Sign up to download”, then sign in with Google or email to get the PDF from KiwiBee Printables.
  2. Print at home or in class for Grade 3; it's no-prep, with no extra materials needed.
  3. Hand it out as classwork, homework, or a quick warm-up.

Good for

ClassworkHomeworkWarm-upCentersSmall groups

More worksheets like this

Likes & comments

See what other teachers think and share a helpful note.

Loading likes and comments…
Worksheet Studio

Need a different version? Make your own.

Generate a fresh worksheet for any grade, topic and language. Free.

Open Worksheet Studio