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Lecture-Based: Concept Introduction

Resource for Grades 9-12

Media Type:
Video

Running Time: 5m 41s
Size: 5.5 MB

or

Collection Funded by:

Betsy Popple uses a lecture-based style of instruction to introduce the concept of area and to briefly review perimeter.

These resources are part of KET's Math Instructional Strategies: Geometry collection.

Supplemental Media Available:

Background Essay

Adult learners often struggle with the difference between the perimeter and the area of a shape. In general, addition is used to find the perimeter, while multiplication is the operation of choice in finding the area. Thus, the perimeter is measured linearly (inches, centimeters, miles) and the area is measured in square units (or units squared; square inches, sq. ft., miles2). Knowing the differences in the operations and relating the concepts to real-world applications (i.e. fencing, buying sod, etc.) can help learners to more fully understand the differences in these concepts.

Discussion Questions

• Why do you think that the learners did not suggest either dividing or subtracting as possible methods to find the area of a rectangle?
• How does dividing the rectangle into squares help learners?

Standards

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