Cette leçon contient 18 diapositives, avec quiz interactifs, diapositives de texte et 1 vidéo.
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USING SCALES
Functional Skills Math Level 1
Slide 1 - Diapositive
Today we'll learn:
- why we use scales
- where we use them in everyday life
- different ways of writing scales
- how to calculate using scales
Slide 2 - Diapositive
Some things are too large to draw or represent on a page, so we need to use scales and scale drawings to make them fit onto the page.
Slide 3 - Diapositive
CAN YOU THINK OF ANY EVERYDAY EXAMPLES OF WHEN SCALES AND SCALE DRAWINGS WOULD BE USED?
Slide 4 - Question ouverte
Slide 5 - Diapositive
There are various ways of writing a scale. Some are shown on a diagram to help us with scale drawings:
Slide 6 - Diapositive
Other scales are written using two units:
Eg 1cm = 10km This means that 1cm on a page is equal to 10km in real life
Slide 7 - Diapositive
Ratios are also used to write scales:
Eg 1 : 50 means that 1cm on the page is equal to 50 cm in real life. The units are always the same in a ratio. Here we're using cms.
Slide 8 - Diapositive
The 50 is called the scale factor and it's what we multiply by to get the real life size. If we're given the real life size and asked for the size on the plan then we divide by the scale factor
Slide 9 - Diapositive
Slide 10 - Diapositive
Slide 11 - Diapositive
Two parks are 120km apart. How far apart will they be on a plan using a scale of 1cm = 12km
A
1.2cm
B
10cm
C
120cm
D
12cm
Slide 12 - Quiz
On a plan, two towns are 3cm apart. How far apart are they in reality with a scale of 1 : 10,000. Change your answer to metres
A
30m
B
3000m
C
300m
D
3m
Slide 13 - Quiz
If the height of the Titanic museum is 50m, how high would a model of it be using a scale 1cm = 10m?
A
5cm
B
50cm
C
10cm
D
100cm
Slide 14 - Quiz
What is the real distance between 2 houses that are 3cm apart on a map using a scale of 1 : 15,000. Change your answer to metres.
A
300m
B
45m
C
30m
D
450m
Slide 15 - Quiz
The height of a skyscraper is 500m. How high would a model of it be using a scale of 1cm = 25m?