# 12C + 12D Area of a rectangle

Area of a rectangle
Schedule:
• Learning goals
• Folding activity
• Area of a rectangle
• Match the perimeter and area with the figure
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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 2

This lesson contains 13 slides, with interactive quizzes and text slides.

Lesson duration is: 60 min

## Items in this lesson

Area of a rectangle
Schedule:
• Learning goals
• Folding activity
• Area of a rectangle
• Match the perimeter and area with the figure

#### Slide 1 -Slide

Learning goals
At the end of this lesson I can:
•  Find the area of a shape by counting sqaures
• Calculate the area of a rectangle with the formula

#### Slide 2 -Slide

Fold away!
1. Find the perimeter and area of the flat cat
2. Fold the flat cat following the fold lines
3. Find the perimeter and area of the square hare
4. Fold the square hare following the fold lines

#### Slide 3 -Slide

Area of a rectangle
Area of a rectangle = Length · Width

What kinds of units do we use for area

#### Slide 4 -Slide

Matching game
Make matched of 4 cards:
- A rectangle
-its perimeter
-its area
-the calculation for its perimeter OR area

Find all 8 matches!!

#### Slide 5 -Slide

Extra practice ( + Help)
Open your book at P. 256

Start with question 1 and time yourself.
How long does it take you to find the area of all the rectangles in question 1?

(You are allowed to use a calculator but you can make it extra challenging by doing it without)

Check your work, for every wrong answer: add 30 seconds to your final time.

For example: A student finished the questions in 3 min and 25 second but made 2 mistakes.
Their final time is 3 min 24 sec + 30 sec + 30 sec = 4 min 24 sec.

#### Slide 6 -Slide

What was your final time for question 1?
Between 0:30 and 1:00
Between 1:00 and 1:30
Between 1:30 and 2:00
Between 2:00 and 2:30
Between 2:30 and 3:00
Between 3:00 and 3:30
Between 3:30 and 4:00
Between 4:00 and 4:30
Between 4:30 and 5:00
Longer than 5 min

#### Slide 7 -Poll

Extra practice (+ help)
Time yourself again for question 2!

Watch out, the lengths are given in different units!!

#### Slide 8 -Slide

What was your final time for question 2?
Between 1:00 and 2:00
Between 2:00 and 3:00
Between 3:00 and 4:00
Between 4:00 and 5:00
Between 5:00 and 6:00
Between 6:00 and 7:00
Longer than 7 min

#### Slide 9 -Poll

Extra practice
P. 257               4, 5, 6

#### Slide 10 -Slide

Challenge
P. 257             5, 9

#### Slide 11 -Slide

Challenge
Surface area: the surface area of a 3D shape is the combined area of all the sides of the shape.

#### Slide 12 -Slide

Challenge
Practice with:

ManageBac > Files > Unit 5 Measurements > Surface area 1
ManageBac > Files > Unit 5 Measurements > Surface area 2