Lesson Plan

Team Triangles Warm-Up Plan

Students will collaboratively review and apply perimeter calculation by racing to build triangles that match given perimeters, practicing turn-taking and providing positive feedback.

This lesson reinforces key geometry skills (perimeter) while integrating social-emotional learning through cooperative problem solving, promoting teamwork habits and confidence in math.

Audience

Time

Approach

Materials

Prep

Prepare Materials

5 minutes

Step 1

Warm-Up – Math & Manners

5 minutes

Step 2

Team Triangle Challenge

12 minutes

Step 3

Cool-Down – Reflection Exit Slip

3 minutes

Slide Deck

Perimeter Refresher

Introduce the concept of perimeter to students. Emphasize that perimeter measures the distance around a shape.

Perimeter Formula for Triangles

Point out the formula for triangles specifically and model writing the formula on the board.

Example Problem

Work through this example step-by-step. Ask students to call out each addition.

Quick Practice

Have students solve these mentally or on scratch paper, then share answers.

Challenge Prompts

Explain that these are example perimeters students will see in the Team Triangles game. Teams will choose side-length strips to match these totals.

Triangle-Building Reminder

Remind students of the triangle inequality so their shapes will close properly.