# 'Measuring'

Last week
- Quantities and units
- Units of length
- Converting units
- Scale
Measuring
1 / 15
Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 15 slides, with interactive quiz and text slides.

Lesson duration is: 45 min

## Items in this lesson

Last week
- Quantities and units
- Units of length
- Converting units
- Scale
Measuring

#### Slide 1 -Slide

We know:

... what an area is and what perimeter is.
... different units of area.
... how to convert units of area.
... how to calculate the area of a rectangle.
Measuring

AREA
PERIMETER
8 ha
(=8hm²)
??
2.8km
??

#### Slide 3 -Slide

The perimeter of a shape is the total length of the edges.

40+22+20+40+31 = 153 cm

#### Slide 4 -Slide

Area is about how much space is covered.

The area of a shape is how many times the unit of area fits onto it.

Units of area

#### Slide 6 -Slide

Units of area
80 dm² = ... m²
80 dm² = 0.8m²
4.5 m² = ... cm²
4.5 m² = 450 dm²
4.5 m² = 45,000 cm²

#### Slide 7 -Slide

Area of a rectangle

1
2

#### Slide 8 -Slide

Area of a rectangle

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.
timer
5:00
finished?
> exercises 17c,d, 18

#### Slide 9 -Slide

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.
b) Calculate the perimeter and the area of a square with sides measuring 5 m.

#### Slide 10 -Open question

Area of a rectangle

a) Calculate the perimeter and the area of a rectangle measuring 7 by 4 cm.

b) Calculate the perimeter and the area of a square with sides measuring 5 m.
Perimeter  7+4+7+4= 22 cm
Area    7x4 = 28 cm2
Perimeter  5+5+5+5= 20 m
Area    5x5 = 25 m2

#### Slide 11 -Slide

Start making exercises 9-22

#### Slide 12 -Slide

Today, we have learned ...?

#### Slide 13 -Slide

• Tomorrow: mandatory!
• Exercises 9-22
• Next week (tuesday): QUIZ
• 9th of June: TEST

#### Slide 14 -Slide

QUIZ 9.1/9.2
• Quantity, unit
• Units of length
• Converting units of length
• Scale
• Perimeter
• Area
• Units of area
• Converting units of area
• Area of a rectangle