Date post: | 21-Jan-2016 |
Category: |
Documents |
Upload: | lesley-ross |
View: | 218 times |
Download: | 0 times |
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