Area and Perimeter Missing Sides | 3.MD.8

Grade Levels
3rd - 4th
Resource Type
Formats Included
  • PDF
50 pages
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  1. This 3rd grade math units bundle includes all the math units you need to teach third grade math for the WHOLE YEAR! There are worksheets, games, hands-on activities, and interactive notebook pages for every third grade math standard. When you purchase the bundle, you save 50% off the price of the in
    Save $152.80
  2. This bundled product includes EVERYTHING you need to teach your students about area and perimeter. It is filled with area and perimeter worksheets, games, activities bundle, mini lessons and interactive notebook entries, and hands-on activities! This aligns with 3.MD.5, 3.MD.6, 3.MD.7 and 3.MD.8.Whe
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This unit includes area activities, worksheets, games, mini-lessons, and interactive notebook pages to help students practice finding missing sides when given the area or perimeter or when students are comparing area and perimeter. This helps third graders understand better the area and perimeter missing sides.

Click here to save 30% when you buy the Area and Perimeter Bundle.

Click here to save 50% when you buy the bundle of 3rd Grade Math Units for the entire school year.

This product includes everything you need to teach students how to find the length of a missing side when they are given the area or perimeter. It also includes how to teach students to compare rectangles and decide if they have the same area or the same perimeter (correlating with standard 3.MD.8).

This product was designed for third graders, but would work great as a review for fourth graders as well.

This product introduces how to find missing side lengths given area or perimeter and comparing two rectangles to determine if they have the same area or perimeter.

There are TWO interactive mini-lessons included that students can glue into their notebooks to help them have something to reference after learning these two concepts. This interactive notebook entry is "no-nonsense" which means that students simply have to cut and glue. There is no folding to make it easier for you to teach the lesson faster and to keep students on track.

In the ten worksheets included, students practice:

-finding missing side length given area

-finding missing side length given perimeter

-comparing rectangles with same area

-comparing rectangles with same perimeter

-drawing rectangles with same area or perimeter

There are THREE differentiated create your own mansion activities where students make their own house using the guidelines given. They have to create a house where some rooms have the same area and some have the same perimeter. The three versions allow you to give each student the version appropriate for them.

There is also a missing side lengths game called where students have the cats go against the dogs! In the game, students have to race against a partner to find all the missing side lengths before the other person wins! One person plays as the cats and the other person plays as the dogs. The first person to put all of their pets on the correct crate missing side lengths wins!

In all, there are over 50 pages included in this product!

Check out the preview to see more!


Looking for more? Check out the rest of my area unit!

Finding Area

Rectilinear Area

Finding Perimeter

Area and Perimeter Word Problems

Finding Missing Sides Given Area or Perimeter

Area and Perimeter BUNDLE!





Identifying Fractions

Fractions on a Number Line

Equivalent Fractions

Comparing Fractions

Third Grade Fraction Unit BUNDLE!


You may also like: Surgeons Classroom Transformation with Rectilinear Area

-This is a room transformation that allows students to become surgeons while learning about rectilinear area at the same time!

You may also like: African Safari Classroom Transformation with Area and Perimeter

-This is a room transformation that allows students to experience they are on a Safari while learning about area and perimeter at the same time!


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The Lifetime Learner

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Total Pages
50 pages
Answer Key
Teaching Duration
1 Week
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to see state-specific standards (only available in the US).
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.


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