This area and perimeter missing sides math unit includes activities, worksheets, games, mini-lessons, and interactive notebook pages to help 3rd grade students practice finding missing sides when given the area or perimeter or when third grade students are comparing area and perimeter.
$7.00
Help your students build confidence solving area and perimeter missing sides problems with this engaging 3rd grade math unit! This resource makes it easy for students to understand how to find missing side lengths when given the area or perimeter and how to compare rectangles with the same area or the same perimeter using clear visuals and guided practice.
This area and perimeter missing sides worksheets unit is packed with hands-on games, interactive activities, and step-by-step mini-lessons to help every student succeed. Students practice calculating missing side lengths, identifying relationships between area and perimeter, and applying their knowledge to real-world problems — all while having fun!
The hands-on games and partner activities make review interactive and exciting, while the error analysis pages and mini-lessons ensure students develop a deep understanding of key geometry concepts.
Whether you’re teaching an area and perimeter unit or reviewing for end-of-year testing, this resource provides everything you need. With over 200 pages of ready-to-use math worksheets, games, and teaching materials, it’s perfect for 3rd grade and can also be used as a review in 4th grade.
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This area and perimeter missing sides worksheets unit has everything you need for direct instruction, guided practice, and fun reinforcement activities:
Two Mini-Lessons:
Includes two interactive notebook entries—one for finding missing sides given area and another for finding missing sides given perimeter. These no-fold, cut-and-glue lessons give students simple visual guides to reference throughout your area and perimeter unit.
10 Differentiated Worksheets:
Students practice:
Finding missing side lengths given area
Finding missing side lengths given perimeter
Drawing rectangles with the same area or perimeter
Comparing rectangles with the same area or same perimeter
Solving real-world and word problems involving missing sides
The worksheets progress in difficulty, ensuring all students are supported and challenged at their level.
4 Error Analysis Pages:
Students review incorrect and correct work samples to strengthen understanding of how to solve for missing sides. These pages are perfect for math talk, partner discussions, and group problem-solving.
Create Your Own Mansion Activity:
Students design their own mansion, making rooms that meet specific area and perimeter requirements. This creative activity has three differentiated versions, letting you tailor difficulty based on your students’ needs.
Game #1: Cats vs. Dogs Game:
Students compete in pairs to solve missing side problems before their opponent. One plays as cats, the other as dogs. The first player to complete their “crates” wins!
Game #2: Build a Pet Shop Game:
Students earn pet shop items by solving problems correctly. Chance cards add excitement and unpredictability, and the first student to fill their pet shop wins.
Game #3: Whole-Class Game – “Bucket Filler!”
Set up task cards around the classroom and let students move between stations solving missing side challenges. Correct answers earn them entries for a small prize drawing.
Game #4: Racing Game – “Line Them Up!”
Students work in teams to line up problem-and-answer cards in the correct order. The first team to complete the sequence correctly wins!
21 Area and Perimeter Posters:
These clear, colorful visuals help students remember formulas, vocabulary, and problem-solving strategies for area and perimeter. Perfect for your geometry math wall or reference board.
All games and activities are provided in both color and black-and-white versions to fit any classroom printing setup.
This area and perimeter missing sides unit is designed for:
Whole-group lessons
Small-group intervention or reteach
Partner or math center activities
Independent practice or early finisher work
End-of-unit review or spiral review
The mix of worksheets, interactive activities, and games makes it easy to keep students engaged while reinforcing key geometry concepts.
This area and perimeter missing sides worksheets unit aligns with:
Common Core:
3.MD.5–3.MD.8 – Recognize area as an attribute, measure area using unit squares, relate area to multiplication and addition, and solve perimeter problems including finding unknown side lengths.
Texas TEKS:
3.7B – Determine the perimeter of a polygon or missing side when given the perimeter and remaining sides.
4.5C – Use models to determine perimeter and area formulas for rectangles.
4.5D – Solve perimeter and area problems with whole-number dimensions.
Florida B.E.S.T.:
MA.3.GR.2.1 – Explore area as an attribute using unit squares.
MA.3.GR.2.2 – Find the area of rectangles with whole-number side lengths using visual models.
MA.3.GR.2.3 – Solve mathematical and real-world perimeter and area problems using visual models and formulas.
Teachers love how clearly this unit breaks down finding missing sides into easy-to-understand steps. The interactive notebook entries and error analysis pages help students visualize how area and perimeter formulas work, while the creative mansion and pet shop games turn practice into fun, meaningful learning.
Students love that they get to draw, design, build, and play while reinforcing important geometry skills. Every worksheet and game is designed to promote confidence, independence, and mastery of 3rd grade math standards.
This 3rd Grade Math Unit makes teaching area and perimeter simple and engaging with low-prep printables, interactive lessons, and cooperative learning games.
Students won’t just memorize formulas—they’ll understand them through play, creativity, and exploration.
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