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Lesson Plans and Worksheets for Grade 3

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Common Core For Grade 3

Videos, examples, solutions, and lessons to help Grade 3 students learn to 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.

Common Core: 3.MD.8

### Suggested Learning Targets

**3 MD 8 Lesson 1**

In this lesson, you will learn how to determine the perimeter of a polygon by adding the side lengths.

**3 MD 8 Lesson 2**

In this lesson, you will learn how to find unknown side lengths of polygons given the perimeter.**3 MD 8 Lesson 3**

In this lesson, you will learn how to find an unknown side length of a rectangle given the perimeter.**Finding the perimeter of Squares and Rectangles- 3.MD.8**
**Find Unknown Side Given Perimeter - 3.MD.8**
**Perimeter of Polygons**

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

Lesson Plans and Worksheets for Grade 3

Lesson Plans and Worksheets for all Grades

More Lessons for Grade 3

Common Core For Grade 3

Common Core: 3.MD.8

- I can identify polygons.
- I can define perimeter.
- I can find the perimeter of polygons when give the lengths of all sides.
- I can find the unknown side lengths of polygons when given the perimeter.
- I can show how rectangles with the same perimeter can have different areas and show rectangles with the same area can have different perimeters.
- I can solve word problems.

In this lesson, you will learn how to determine the perimeter of a polygon by adding the side lengths.

In this lesson, you will learn how to find unknown side lengths of polygons given the perimeter.

In this lesson, you will learn how to find an unknown side length of a rectangle given the perimeter.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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