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Grade 3 · Measurement & Data · 3.MD.D.8

Perimeter and Missing Sides Worksheets

Download the practice worksheet free, with no sign-up. Problems climb from Mild to Spicy, with Mr DJ’s worked example to help you begin. Get the complete teaching materials in the paid lesson pack.

First page of the perimeter and missing sides practice worksheet

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PDFPractice worksheet11 pages · 9 questions

Practice prints on US Letter paper. Free for classroom and home use.

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One topic. A complete lesson.

HomeworkIncluded
Exit ticketIncluded
Worked answer keyIncluded
Lesson slides PDFIncluded
Editable lesson slidesIncluded
Matching math gameIncluded
Build Confidence support guideIncluded
Go Deeper extensionIncluded

Print, project, edit and play. The matching game uses the same Math Crew and pepper levels.

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Key idea

find polygon perimeters, missing sides and area-perimeter comparisons.

Sample problems

A rectangle has sides 3 cm and 5 cm. Find perimeter and label all four sides.
A triangle has sides 3 m, 5 m and 6 m. Find perimeter.
A rectangle has perimeter 16 cm. One side is 3 cm. Find the adjacent side.
Draw rectangles 3 by 5 and 2 by 6. Compare perimeters and areas.

Common mistakes to watch for

Name the units. Use a picture or another calculation to check.

The answer key explains each one, so you can tell what a wrong answer means.

How to use this set

Teach with the slides (about 15 minutes): a warm-up, the big ideas, a “spot the slip” challenge, Mr DJ’s worked example, and a pick-your-pepper round on whiteboards. Or watch the video together.
Practice with the worksheet. Everyone does Mild and Medium, then climbs to Spicy and Extra Spicy.
Check understanding with the exit ticket, and send the homework home.
Mark with the answer key — each answer shows the steps and the most likely mistake. The slides’ teacher notes are in the key too.

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