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: Slide
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This lesson contains 16 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

Items in this lesson

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 -Slide

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

Slide 2 -Slide

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

Slide 3 -Quiz

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

Slide 4 -Slide

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

Slide 5 -Quiz

Explanation:
Only on a vertical axis we may use a ZIGZAG, not on a horizontal axis!

Slide 6 -Slide

Time to work quietly on E1 - E8.
Later a few more fine points are discussed!
timer
15:00

Slide 7 -Slide

Before you go on with E1 - E8 ....
we have a look at some details again!

Slide 8 -Slide

Talking about scale ...

Slide 9 -Slide

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

Slide 10 -Slide

1 cm = ..... hours

Slide 11 -Mind map

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 -Slide

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

Slide 13 -Slide

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

Slide 14 -Quiz

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 to 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 -Slide

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