Five-Minute Check (over Lesson 14–1)

Main Idea and Vocabulary

Example 1:Estimate Areas

Example 2:Estimate Areas

Example 3:Estimate Areas

• I will find and estimate the areas of figures by counting squares.

• area

Estimate Areas

Find the area of the figure at the right.

Step 1 Count the number of whole squares in the figure.

7 whole squares = 7 square units

Step 2 Count the number of half squares in the figure.

Estimate Areas

Step 3 Add the number of whole and half squares.

Answer:

1. A

2. B

3. C

4. D

0% 0%0%0%

A. 22 square feet

B. 24 square feet

C. 26 square feet

D. 30 square feet

Find the area of the figure.

Estimate Areas

The diagram to the right shows the floor plan for a shed. One square on the grid represents 1 square foot. About how many square feet is the area of the shed floor?

Step 1 Count the number of whole squares in the diagram.

37 whole squares = 37 square feet

Estimate Areas

Step 2 Count the number of partial squares in the diagram.

4 partial squares is about 2 square feet

Step 3 Add the number of whole and partial squares.

37 + 2 = 39 square feet

Answer: The area of the shed is about 39 square feet.

1. A

2. B

3. C

4. D

0% 0%0%0%

A. about 10 square feet

B. about 13 square feet

C. about 15 square feet

D. about 20 square feet

One square on the grid represents 1 square foot. About how many square feet is the area of the figure?

Estimate Areas

A lake is shown to the right. Each square represents 1 square mile. Estimate the area of the lake.

Step 1 Count the number of whole squares. There are 13 whole square which is 13 square miles.

Estimate Areas

Step 2 Count the number of partial squares.

20 partial squares is about 10 square miles.

Step 3 Add the number of whole and partial squares.

13 + 10 is about 23 square miles.

Answer: The area of the lake is about 23 square miles.

1. A

2. B

3. C

4. D

0% 0%0%0%

A. about 17 square miles

B. about 21 square miles

C. about 30 square miles

D. about 36 square miles

Each square represents 1 square mile. Estimate the area of the shape below.

End of the Lesson

Five-Minute Check (over Lesson 14–1)

Image Bank

Math Tool Chest

Volumes of Prisms

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 14–1)

A. 26 yd23

Find the perimeter of the figure.

B. 23 yd23

C. 22 yd35

D. 21 yd23

1. A

2. B

3. C

4. D

0% 0%0%0%

(over Lesson 14–1)

Find the perimeter of the figure.

A. 48.3 m

B. 48.9 m

C. 49.2 m

D. 49.3 m