Unit 10: Area - Lesson 1

Unit 10: Area

Lesson 1: Area of Rectangles

Vocabulary:

Area: The amount of space a 2D shape takes up.

Find Area 2 Ways:

+ Counting Grids

+ Multiplication

Units are Squared or units²

Multiple Choice

In what units is area measured?

• centimeters
• cubic units
• square units
• PENGUINS

Multiple Choice

What is the Area of the Rectangle?

[HINT: Count the squares]

• 12 units²

• 15 units

• 15 units²

• 45 units²

When to use formula

You will not always be given a shape with squares inside to count.

You will be given 2 measures:

Length [long side] and Width [short side]

Based off of the picture, the rectangle has a:

+ Width of 5 units

+ Length of 3 Units

Area of Rectangle

You will MULTIPLY length and width to get the AREA.

A = length x width

A = l x w

Multiple Choice

How do you find the area of a rectangle?

• Length + Length + Length + Length
• Length + Width
• Length x Width
• Width x Width

Multiple Choice

Calculate the area of the rectangle.

A = length x width

• 28 units

• 28 units²

• 48 units

• 48 units²

Multiple Choice

A rectangle measures 8 inches wide and 7 inches long. What is the area of the rectangle?

• 15 in²
• 56 in²
• 30 in²

Multiple Choice

What is the area of the rectangle?

• 15 sq cm
• 15 cm
• 2 
• 16 cm

Working Backwords

Often you will be given the Area of a shape and one of its side measures, and me tasked with finding the missing side measure.

Step 1: PLUG values into formula

Step 2: Get the unknown variable by itself, through division

Multiple Choice

The area of a rectangle is 63 sq. inches.  One side length is 7 inches.  What is the other side length?

• 9 in.
• 7 in.
• 6 in.
• 10 in.