What's In A Name? Finding Perimeter
Students will be able find the perimeter of a given shape on graph paper.
Introduction (15 minutes)
- Tell your students that they will learn how to write their initials in block letters on graph paper.
- Demonstrate by writing your initials in block letters on graph paper.
- After demonstrating this style of writing, hand out graph paper to students.
- Instruct them to write their initials in block style letters following the lines on the graph paper. Emphasize that their letters should be at least 3 squares high and 2 squares wide.
- Walk around, and check student work. Guide students who are struggling to write in block style.
Explicit Instruction/Teacher Modeling (10 minutes)
- Inform students that they will be using the block style initials that they created to practice the perimeter formula. Explain that the perimeter of a shape is the length of the outside.
- Review the formula for perimeter with students.
- Create an anchor chart as you review the formula with students. Include a visual with the formula. Display the anchor chart for reference throughout the lesson.
- Take your graph paper block letter initials that you made during the introduction, and demonstrate how to find the perimeter of your block letters.
- Begin by counting the number of graph squares on all sides of your block initials.
- Write down the number of squares for each side next to the side.
- Using the perimeter formula, model the process of adding all of the side measurements to find the perimeter.
Guided Practice/Interactive Modeling (15 minutes)
- Instruct students to count the graph paper squares for each side of their initials and write the amount down next to the side.
- Have students exchange papers with a partner after they have recorded totals for all sides. Direct partners to check other students' data for accuracy.
Independent Working Time (10 minutes)
- Ask your students to use the perimeter formula to find the perimeter of each individual letter.
- After students have found the perimeter for each initial, have them write down their totals.
- Enrichment: Challenge your students to find an additional perimeter measurement. After they calculate the perimeter with graph paper squares, give them rulers. Ask them to find the perimeter of their letters in inches.
- Support: Work with struggling students in a small group. Reteach addition strategies for adding multiple numbers. Give your students calculators to check for accuracy.
Assessment (10 minutes)
- After everyone has recorded the perimeters for each letter, ask your students to exchange their papers with a partner.
- Direct your students to compute their partners' perimeters and compare answers.
- Note which students recorded inaccurate perimeters.
Review and Closing (10 minutes)
- In a large group, discuss the activity with students.
- Ask for “real life” examples of using perimeter.
- Following the discussion, ask your students to outline the perimeter of each letter with a colorful marker and decorate their initial perimeter papers.
- Display completed papers in the room to create a colorful display of their perimeter skills.