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What you will learn from this videoWhat you will learn
- That we can find the area of a rectangle by counting squares.
- We can also find the area of a rectangle by using a formula.
- that this knowledge can help us cover a wall with posters, make padding for somersaults, and even make a cape!
- Discussion Questions
Before Video
How can you use an array to find the product of 12 and 8?ANSWERYou can make an array that is 12 columns and 8 rows and add 12 eight times to find 96.
Length is a measurement that tells how far it is from one end of something to the other end. Length is measured in units such as centimeters, meters, inches, feet, and miles.
ANSWERIt is important to have measurement units that other people can understand and know are the same size.
A square is a shape with four sides that are all the same length and four square corners.
Yes. You could count the number of tiles and say that the room floor takes up that number of tiles.
After Video
What is area? How is it measured?ANSWERArea is the amount of space inside a shape. Area is measured using square units.
You could draw a shape on the paper and count the number of square units inside the shape.
You can find the number of cells in an array by multiplying the number of rows by the number of columns. This is the same idea as finding area, but the cells are square inches. 6 inches times 8 inches is 48 square inches.
You can break the shape up into smaller pieces that are squares and rectangles, find the area of the smaller pieces, and then add them together. An L or a T can each be broken into two pieces that are rectangles.
Lars has 20 photos left over. Garrett uses 8 × 10 = 80 photos. Lars only uses 12 × 5 = 60 photos. 80 – 60 = 20 photos left over.
- Vocabulary
- Area DEFINE
Area is the amount of space inside a closed, two-dimensional shape.
- Square DEFINE
A square is a polygon with four sides that are the same length and four right angles.
- Rectangle DEFINE
A rectangle is a polygon with four sides and four right angles.
- Unit of measurement DEFINE
A way to communicate the size of a measurement.
- Square unit DEFINE
A square unit is a square with side lengths of 1 unit that is used to measure the area of a shape.
- Formula DEFINE
A rule or fact written with mathematical symbols. The formula for the area of a rectangle is length times width.
- Array DEFINE
Made by arranging items or shapes into equal rows and columns.
- Sum DEFINE
The result of addition.
- Composite shape DEFINE
A shape that can be made using smaller shapes. For example, an L can be made using two rectangles. The area of a composite shape is the sum of the areas of the smaller shapes.
- Area DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide