Finding Area and Missing Measures

This lesson covers the concept of combined rectangles and how to calculate their area using various methods, including grid paper, area formulas, and logical reasoning. Practical applications, such as carpeting and garden expansion, are used to illustrate these concepts. The lesson emphasizes the commutative properties of multiplication and addition, and concludes with a preview of the next lesson on finding unknown measures.

Why is it important to watch lesson 13.2 before this one?

• It is a prerequisite for all math lessons.

• It contains unrelated content.

• It introduces the concept of combined rectangles.

• It provides foundational knowledge for this lesson.

What is the first step in finding the area of combined rectangles on grid paper?

• Use a calculator to find the area.

• Count the number of unit squares inside the shape.

• Measure each side with a ruler.

• Estimate the area visually.

How can you determine a missing side length in a rectangle?

• Measure it with a ruler.

• Assume it is equal to the longest side.

• Use the length of the opposite side.

• Guess based on the shape.

What is the area of a rectangle with a base of 5 feet and a height of 2 feet?

• 7 square feet

• 15 square feet

• 12 square feet

• 10 square feet

How does the commutative property of multiplication help in finding the area?

• It simplifies subtraction of areas.

• It helps in dividing rectangles.

• It lets you multiply sides in any order.

• It allows you to add areas in any order.

In the carpeted space example, what is the total area of the carpet?

• 150 square feet

• 141 square feet

• 160 square feet

• 120 square feet

What is a key strategy for finding missing measures in rectangles?

• Using a calculator.

• Drawing additional lines.

• Using opposite sides' equality.

• Guessing based on shape.

What will the next lesson focus on?

• Introducing new shapes.

• Advanced multiplication techniques.

• Reviewing previous lessons.

• Finding unknown measures.