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.

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Presentation transcript:

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 Another Way: Multiply Sandbox - Find the area of the sandbox. 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 10 ft 5 ft

Area of a Rectangle To find the area of a rectangle, multiply the length by the width. A = l x w w l 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

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.

Bales Bucks!!

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