5-Minute Check Find the perimeter of a rectangle that has a length of 12 feet and a width of 3 feet. Find the perimeter of a square whose length is 9.

5-Minute Check•Find the perimeter of a

rectangle that has a length of 12 feet and a width of 3 feet.

•Find the perimeter of a square whose length is 9 yards.

Measurement: Area

By Mr. Bales

Objective• By the end of the lesson, you will be able to

find the area of rectangles and squares.• Standard 4MG1.4 - Students will

understand and use formulas to solve problems involving….areas of rectangles and squares.

• Standard 4MG1.1 - Students will measure the area of rectangular shapes by using appropriate units, such as square centimeters, square meter, square kilometer, square inch, square yard, or square mile.

Introduce

• Using 16 base-ten block units with a partner, I want you to make different types of rectangles using all 16 units.

• For example, I could have 1 row of 16 units as one rectangle.

• Please write down all the different ways you and your partner come up with.

What lengths and widths can you use to make a rectangle with 16 units?

Teach

• What is the similarity between the length and width of a square block?

• Which of your models showed a square made from the 16 blocks?

• How is a rectangle that measures 2 units by 8 units the same as one that measure 8 units by 2 units?

• How are the two rectangles different?

Hu Family

• The Hu family wants to put the sandbox shown in their backyard.

• What is the area of the sandbox?

10 ft

5 ft

Area

• Area is the number of square units needed to cover a region or figure without any overlap. It is measured in square units.

Area of a Rectangle

• One Way: Count

• There are 50 squares

• Another Way: Multiply

• Multiply the length times the width to find the area.

• A = length x width• A = l x w• A = 10 ft x 5 ft• A = 50 square feet

Sandbox - Find the area of the sandbox.

10 ft

5 ft

Area of a Rectangle

• To find the area of a rectangle, multiply the length by the width.

• A = l x wl

ww

l

Area of a Square

• To find the area of a square, multiply the length of one side s by itself.

• A = s x s s

s

s s

Area of a Square

• What is the area of the picture if its sides are all 4 inches in length?

• A = side x side• A = 4 in x 4 in• A = 16 square inches• The area of the picture is 16 square

inches.• Watch Mrs. Benson explain: Mrs. Benson!!

4 in.

4 in.

Bales Bucks!!

Assignment

• Page 446 - #’s 6 - 15• Get them all correct, No Math

Homework