#### Lesson Plan

## Calculating Area

### Alignments:

### Grade Levels

### Related Academic Standards

### Assessment Anchors

### Eligible Content

### Big Ideas

### Concepts

### Competencies

### Objectives

Students will explore the concept of area. Students will:

- choose the appropriate units of measure for area for a given shape or region.
- understand the difference between estimated and actual area.
- develop different strategies to find the area of irregular shapes.
- apply multiplication to the area of rectangles and squares.

### Essential Questions

- What does it mean to estimate or analyze numerical quantities?
- When is it appropriate to estimate versus calculate?
- What makes a tool and/or strategy appropriate for a given task?
- Why does “what” we measure influence “how” we measure?
- In what ways are the mathematical attributes of objects or processes measured, calculated, and/or interpreted?
- How precise do measurements and calculations need to be?

### Vocabulary

**Area:**The number of square units needed to cover a flat surface.**Estimate:**A rough judgment or calculation.**Square Unit:**A unit used to measure area.

### Duration

90–120 minutes

### Prerequisite Skills

Prerequisite Skills hasn't been entered into the lesson plan.

### Materials

- standard measuring tools (ruler, yardstick, meter stick)
- grid paper (M-4-1-2_Square Centimeter Grid Paper.doc and M-4-1-2_Square Inch Grid Paper.doc)
- large sheets of grid paper (optional)
- Shape 1 (M-4-1-2_Shape 1.doc)
- Shape 1 with Unmarked Square Inches (M-4-1-2_Shape 1 with Unmarked Square Inches.doc)
- Shape 1 with Square Inches (M-4-1-2_Shape 1 with Square Inches.doc)
- Shape 1 with Square Centimeters handout (M-4-1-2_Shape 1 with Square Centimeters.doc)
- construct drawings of a square foot, a square yard, and a square meter on chart paper for students to see their relative sizes
- chart paper
- construction paper
- 3 x 5 inch index cards (optional)
- Pattern-block pieces (optional)
- rulers with inches and/or centimeters
- various rectangles cut out with similar or equal areas
- Area Four Square activity (M-4-1-2_Area Four Square and KEY.doc)
- Area Chart (M-4-1-2_Small Group Area Chart.doc)

### Related Unit and Lesson Plans

### Related Materials & Resources

The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.

- Interactive Web site calculation of area, various levels of difficulty ~ choose area

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html

- Interactive Web site calculation of area of irregular/regular shapes

http://www.shodor.org/interactivate/activities/AreaExplorer/

- Interactive Web site measurement of area with immediate feedback

http://www.studyzone.org/testprep/math4/k/squaresp.cfm

### Formative Assessment

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