Estimate Area with Unit Squares

Look at this shape. Would you find the exact or estimated area?

• exact

• estimate

Kimmy says this shape has an area of 14 square feet. Do you agree? Explain.

• I agree because I counted 14 squares on the picture.

• I disagree because I counted 4 complete squares, so the area is 4. She also does not know the label is feet. It should be units.

• I disagree because I counted 4 complete middle sqaures, almost 4 complete squares in the second and fifth column, and 4 half squares in the first and sixth column. I put those together to make 2 squares. 4 + 4+ 2 = 10 square units. Square feet is also the incorrect label.

• I disagree becausre her area is 12 square units because there is a part of the red circle in 12 squares.

Find the area.

• 24 square inches

• 46 square inches

• 28 square inches

• 49 square inches

John draws this rectangle. Which explanations are correct to find the area?

• John should add 5 + 4. His area is 9 in.

• John can draw in 5 rows and 4 columns. He can count all the squares. His area is 20 square inches.

• John can break the shape into 2 parts. He can do (3x2) + (4x2) and find the area of 14 square in.

• John can do 5 x 4 because a rectangle is an array. He can multiply length times width because it is another way to say rows times columns. His area is 20 square inches.

Ms. Tomasina wants to cover her bulletin board with plastic. The bulletin board is pictured above on a grid.

Which is the best way to find the area of the bulletin board? 

• Count the number of units around the bulletin board. 

• Count the total number of squares on the bulletin board. 

• Count the units along the length of the bulletin board and double that number. 

• Count the number of squares along the width of the bulletin board and multiply that number times itself. 

• A

• B

• C

• D

• A

• B

• C

• D

Ms. Tomasina wants to cover her bulletin board with plastic. The bulletin board is pictured above on a grid. Which is the best way to find the area of the bulletin board?

• Count the number of units around the bulletin board.

• Count the total number of squares on the bulletin board.

• Count the units along the outside.

• She can not cover her bulletin board.

What is the total area of the pink model?

• 3 units squared

• 4 units squared

• 7 units squared

• 12 units squared

What is the area of this shape?

• 12

• 24 square units

• 12 units

• 11 square units