1TH Ch3 Summary learning goals p.112/117 (2)

Extra exercises, p.122/123 ...
is a good way to go through all content from Ch 4 Graphs once more, 
to get prepared for the test!
First we single out a few fine points.  
So, please open your Textbook and Notebook!     
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Slide 1: Tekstslide
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In deze les zitten 16 slides, met interactieve quizzen en tekstslides.

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Extra exercises, p.122/123 ...
is a good way to go through all content from Ch 4 Graphs once more, 
to get prepared for the test!
First we single out a few fine points.  
So, please open your Textbook and Notebook!     

Slide 1 - Tekstslide

TASK 1: Point E is (5, 8) or (8, 5) ?
Key in in next slide.
This is the graph 
from exercise E3:

Slide 2 - Tekstslide

What are the good coordinates?
A
(5, 8)
B
both are good
C
(8, 5)
D
neither are good

Slide 3 - Quizvraag

TASK 2:                        
STATEMENT:
 'There's a mistake in the graph below, because a ZIGZAG on the horizontal axis is missing. '             TRUE or FALSE?
Key in your answer 
in the next slide.
(This is exercise E4.)

Slide 4 - Tekstslide

True or False?
(Think about the reason for your choice!)
A
False
B
True

Slide 5 - Quizvraag

Explanation:
Only on a vertical axis we may use a ZIGZAG, not on a horizontal axis!
That's why the statement is false.

Slide 6 - Tekstslide

Time to work quietly on E1 - E13, p.112-117
Later a few more fine points are discussed!


timer
15:00

Slide 7 - Tekstslide

Before you go on with E1 - E13
we have a look at some details again!
Talking about details,


Slide 8 - Tekstslide

Talking about scale ...

Slide 9 - Tekstslide

TASK 3:
What's a good scale for the horizontal axis?
1 cm = ... hours (key in in next slide)

Slide 10 - Tekstslide

1 cm = ..... hours

Slide 11 - Woordweb

Solution:
Time in hours were: 6, 9, 12, 15, 18, 21 and 24 
They are all threesomes (= multiples of 3).
This means that 1 cm = 3 hours is clearly the best choice!
In that case the length of the axis will be:
(24 - 6) : 3 = 18 : 3 = 6 cm and that's all right. 

Slide 12 - Tekstslide

TASK 4:
What's a good scale for the vertical axis?
1 cm = ... temperature (key in in next slide)

Slide 13 - Tekstslide

A good scale is ....
A
1 cm = 1 degree
B
1 cm = 3 degrees
C
1 cm = 2 degrees

Slide 14 - Quizvraag

Solution Task 4:
The temperature varies from 13.5 to 26 degrees. So 26 - 13.5 = 12.5 degrees have to be given a place on the vertical axis. Use a zigzag for 0 - 13 degrees.
+ if you take 1 cm = 1 degree, the the axis will be 12.5 : 1 = 12.5 so about 13 cm long. That's too long.
+  if you take 1 cm = 2 degrees, then the axis is 12.5 : 2  is about 6 cm. Fine too, although short.
+ Finally, taking 1 cm = 3 degrees, then the axis' length is 12.5 : 3 is about 4 and that's
   a bit too short.

Slide 15 - Tekstslide

Homework time!
DO:  extra exercises, p.122/123 
timer
20:00

Slide 16 - Tekstslide