# H9 'Measuring' -- Prior knowledge + §1

Today, you will learn ...

... what a quantity is and what a unit is.
... how to convert units (of length).
... what the term scale means,
and how to use scale.
CHAPTER 9:    Measuring
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Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 11 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

## Items in this lesson

Today, you will learn ...

... what a quantity is and what a unit is.
... how to convert units (of length).
... what the term scale means,
and how to use scale.
CHAPTER 9:    Measuring

#### Slide 1 -Slide

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Would you like to swim in a big pool on your holidays? Then you will love the San Alfonso del Mar resort in Chile. This resort has the biggest swimming pool in the world! The swimming pool has a length of 1.013 metres, an area of 8 ha and is up to 35 metres deep.
The pool contains 250 million litres of filtered sea water from the Pacific Ocean, wich is nearby. The water is heated by the sun and its temperature can be up to 26 °C.

#### Slide 2 -Slide

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Something you measure is called a quantity.

A quantity is measured using a unit.

#### Slide 3 -Slide

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Quantities
and units

#### Slide 4 -Mind map

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Quantity
Measuring instrument
Unit
measuring jug
litre
time
a scale
length
degrees Celsius
stopwatch
weight
ruler
centimetre
seconds
volume
thermometer
grams
temperature

#### Slide 5 -Drag question

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Units of length

#### Slide 6 -Slide

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23 m = ... cm
23 m = ... cm
23 m = 230 dm
230 dm = 2300 cm
82 hm = ... km
82 hm = ... km
82 hm = 8.2 km

#### Slide 7 -Slide

23 · 10 · 10 = 2300

82 : 10 : 10 = 0.82

stopwatch
00:00
Start making exercises 1-5

#### Slide 8 -Slide

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Scale

A scale of 1 : 200 means the measurements of the real object are 200 times as large as those of the model.

#### Slide 9 -Slide

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Scale

Use a scale of  1 : 200

- If the scale model of a bridge is 150 cm long,
how long is the real bridge?

- How tall is the scale model of a house that is    9 metres tall?

150 x 200 = 300,000 cm
(= 3 km)
9 : 200 = 0.045m
(= 4.5 cm)

#### Slide 10 -Slide

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Today, we have learned ...?

#### Slide 11 -Slide

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