Third Grade Area Counting Unit Squares

Calculate the area of the shape below.

• 16 cm2

• 17 cm2

• 14 cm2

• 15 cm2

Each square in this rectangle equals 1 inch. How do you find the area?

•  There are 7 rows and 8 columns, so you should add 7 + 8 to get 15 total blocks.

• There are 8 columns and 7 rows, so you should subtract 8 – 7 to get 1 rectangle

• There are 7 rows and 8 columns, so you should multiply 7 × 8 to get 56 square inches

• D. There are 8 columns and 7 rows, and you add the 8 from top and bottom and the 7 from both sides to get 8 + 8 + 7 + 7 to get an area of 30.

Lilly wants to find the area of this piece of glass using gray square tiles. Each tile has the area of 1 square unit. Which models show a way that Lily could find the area of the piece of glass?

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What does area mean?

• the distance around a shape

• half the distance around a shape

• the amount of space outside a shape

• the amount of space inside a shape

What is the area of the shaded portion?

• 10 square units

• 13 square units

• 30 square units

• 20 square units

Vince says the area of this shape is 4 square units. Is Vince correct? Choose the best explanation!

• Yes, Vince is correct because I count four gray rectangles, so the area is four square units

• Yes, Vince is correct because he used four squares to fill in his shape, so the area is four square units.

• No, Vince is wrong because he used more than four square units to fill his shape.

• No, Vince is wrong because he used rectangles and not squares to fill his shape.

When can we use area in real life?

• We can use area to find out how much fabric we need to make a blanket to fit on our bed.

• We can use area to find how much boarder we need to go around the outside of a bulletin board.

• We can use area to find out how much paint we need to cover a wall.

• We can use area to find out how much string we need to cut to make a bracelet for our wrist.

What is the area?

• 16 units

• 8 units

• 8 sq units

• 16 sq units

How do you find the area of a shape?

• Counting the square tiles on the outside of a figure.

• Counting the square tiles on the inside of a figure.

What is the area of this shape?

• 10 square units

• 10 units

• 12 square units

• 12 units