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1TH/Vwo §5.3 Scale
§5.3 Scale
LEARNING GOAL:
how to calculate scale using a ratio table
1 / 27
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Slide 1:
Tekstslide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
In deze les zitten
27 slides
, met
interactieve quizzen
en
tekstslides
.
Lesduur is:
50 min
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Onderdelen in deze les
§5.3 Scale
LEARNING GOAL:
how to calculate scale using a ratio table
Slide 1 - Tekstslide
Slide 2 - Tekstslide
§5.3 Scale
HOW ?
BY MAKING RATIO TABLES FOR EVERY EXERCISE !!
JUST LIKE IN §5.1 and. §5.2
On the TEST about Ch5 this will be asked from all the time.
Slide 3 - Tekstslide
§5.3 Scale
Celebrating your birthday, inviting 300 people,
is something done ON A LARGE SCALE.
Slide 4 - Tekstslide
Vital question for 'scale':
'What does 1 cm in the drawing represent in reality?!'
This drawing could be a map of a town, a country or a
continent,
but also the drawing of a person, an animal, or whatever.
Let's look at a few examples!
Slide 5 - Tekstslide
Slide 6 - Tekstslide
Slide 7 - Tekstslide
Vital question for 'scale':
What does 1 cm in the drawing represent in reality?!
This drawing could be a map of a town,
but also the drawing of an animal, or whatever.
Let's look at an example!
Slide 8 - Tekstslide
Example of 'scale':
Slide 9 - Tekstslide
Slide 10 - Tekstslide
What is the right scale for the drawing of the weasel?
A
1 : 7.5
B
15 : 1
C
1 : 15
D
30 : 2
Slide 11 - Quizvraag
Slide 12 - Tekstslide
Slide 13 - Tekstslide
Slide 14 - Tekstslide
Scale 1 : 15 meaning 1 cm on the drawing
equals 15 cm in reality.
Slide 15 - Tekstslide
Slide 16 - Tekstslide
Homework time.
+ Later a few more slides follow!
+ CORRECT the following MISTAKE in your Paper Book:
p.185 C5a. '0.016 mm' should be '0.016 cm' !
timer
15:00
Slide 17 - Tekstslide
Up to now ...
The objects (thingies) were drawn much smaller than they are in real life. However, this is going to change!
Fleas (vlooien) or ticks (teken) are seen under a microscope or in a biology book much greater than they really are.
In that way we can see what they really look like!
Slide 18 - Tekstslide
Slide 19 - Tekstslide
A
2 : 8
B
4 : 1
C
1 : 4
D
0.5 : 2
Slide 20 - Quizvraag
So the scale is 4 : 1 ??!
Shouldn't this result be:
1 : 4 ?
No, watch the next slide!
Slide 21 - Tekstslide
Slide 22 - Tekstslide
Did you notice this:
No matter if the scale is about something smaller or larger than the picture, if possible we always use the number 1 !
So, not 2 : 10 but 1 : 5
However we write 3 : 2 and not 1 : 2/3
No fractions or decimal numbers in a scale !
TRY ONE MORE SCALE TASK now.
Slide 23 - Tekstslide
ANS
timer
1:00
Slide 24 - Tekstslide
Solution:
1. 2.75 cm = 27.5 mm
2. 27.5 : 5.5 = 5
3. 5 mm in the drawing
represents 1 mm in reality, so
4. scale is. 5 : 1
Slide 25 - Tekstslide
Slide 26 - Tekstslide
Homework time
+ Make §5.3 Scale now.
+ Good luck!
Slide 27 - Tekstslide
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