3.MD.8 – How I Met Your Perimeter

Regal Tutors Owl

Kids,
Let me tell you the story of how we met… perimeter. It all started with a packet — this packet. A packet full of discovery, of measurement, of math destiny. A packet where numbers lined up, sides were counted, and shapes came together in the name of geometry.

This 6-worksheet collection was designed to help students conquer each aspect of Common Core Standard 3.MD.8:

3.MD.8 Solve real-world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.

It’s a packet that doesn’t just ask questions — it builds confidence. Whether teachers were launching their unit, reviewing after a break, or reinforcing key concepts before the big test, this packet delivered the full love story. It’s a step toward a long-term relationship with geometry.

Inside, you’ll find problems that challenge, puzzles that spark curiosity, and opportunities for students to see how math pops up in the world around them. Because math isn’t just numbers on a page — it’s fences around gardens and frames around pictures waiting to be measured.

So gather ‘round, grab your pencils, and let’s start from the beginning…

3.md.8 calculate perimeter

You can download this packet by clicking on the purchase button below. You can find other math for your students on our math page!

P.S. This resource is also available for purchase from in our TPT Store if you want to do that!