How Do You Find the Area of a Triangle?

If things are shaping up as they should in your math lessons, your students are on to calculating the area of geometric shapes and…

They’ll need a fun way to put the formulas to work! 

To play, students will calculate the area of each triangle on the board. Then, they’ll find the puzzle piece with the matching measurement, looking carefully at each label to identify centimeters, inches, etc. Students can calculate the area of a triangle by multiplying the base and height lengths together and then dividing by 2.

This activity can be played during independent work time, in your math center, or as a guided math activity by calling students up to the board to complete one piece at a time.  

By completing this activity, students show they can use the correct mathematical formula to find the area of a triangle with whole-number and decimal dimensions.

Tips for Differentiation + Scaffolding 

A team of dedicated, experienced educators created this resource to support your math lessons. 

If you have a mixture of above and below-level learners, we have a few suggestions for keeping students on track with these concepts: 

🆘 Support Struggling Students

Print the slide for students to find the area of each triangle first. They can do this independently or with a partner. Once students calculate the areas, they can go back to the interactive game to move the puzzle pieces into place. This focus time allows students to write down the equation rather than rely on mental math. 

➕ Challenge Fast Finishers

Have students create their own area puzzle to swap with a friend! Students draw a picture and overlap it with a grid (9 squares for a 3×3 grid or 16 squares for a 4×4 grid). Then, they create area shape problems in the grid format, writing the answer for each problem on the corresponding picture piece. Students cut up the picture into squares and give the puzzle to a friend to try.

Plan lessons for all ability levels with our 10 Best Scaffolding Strategies! 

Easily Prepare This Resource for Your Students

Use the Download button to access the interactive Google Slides version of this resource. 

Assign this interactive activity in Google Classroom. Please be sure to open in Edit mode, not Presentation mode. Students will drag and drop each puzzle piece to the correct location on the grid.

While you’re here, check out more activities and teaching resources that fill your lesson plans and students’ brains:

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Area of 2D Shapes — Poster Set

Use this set of posters to teach how to find the area of 2D shapes.

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Area Worksheets

Practice finding the area of different shapes with this set of 4 worksheets.

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Interactive Area Puzzle (Squares and Rectangles)

Find the area of 16 shapes on the board and match the corresponding pieces to reveal a mystery picture.