1TH/Vwo §6.2 Percentages

§6.2 Percentages
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Slide 1: Tekstslide
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In deze les zitten 28 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 50 min

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§6.2 Percentages

Slide 1 - Tekstslide

Question:
What is used in both situations?
Answer in next slide!

Slide 2 - Tekstslide

In both situations a ............. is used.

Slide 3 - Woordweb

Answer:
A RATIO TABLE !
On the right you see     
an example of it.

Slide 4 - Tekstslide

Let's do a Task together, using a Ratio Table.
+ pay attention to every little step
+ your teacher will explain this Task
+ soon you will do one yourself!

Slide 5 - Tekstslide


This calls for a Ratio Table!

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Slide 8 - Tekstslide

Slide 9 - Tekstslide



Watch what a subtle role is played by the number '1' !
Going from 20 to 6 directly is more difficult, 
so we go from 20 to 1 to 6, which is much easier!

Slide 10 - Tekstslide

The percentage of pupils is ...
A
25
B
35
C
30
D
40

Slide 11 - Quizvraag

Slide 12 - Tekstslide

summarizing:

Slide 13 - Tekstslide

Reminder:
When making the homework,
Make sure you produce a RATIO TABLE for every exercise!

Slide 14 - Tekstslide

Slide 15 - Tekstslide

Slide 16 - Tekstslide

Do the following exercise.
+ Open your Notebook
+ Take your pen, pencil and geo triangle
+ Watch the next slide! 
+ Try the exercise yourself.
   (this exercises is also in your book, p.180)

Slide 17 - Tekstslide

Apply what you just learned:
timer
4:00

Slide 18 - Tekstslide

Slide 19 - Tekstslide

Now work for yourself on §6.2 (= homework).

+ Make RATIO TABLES for every exercise!
+ No calculator; work it all out on paper and in your head.
+ Skip 12
+ Later follows a new instruction. 
timer
12:00

Slide 20 - Tekstslide

New instruction:
+ Up to now we calculated a percentage, in the table below.
+ However from exercise 15 on it's the other way around.
+ Now we will calculate the number, up!
+ Follow the coming example.

Slide 21 - Tekstslide

Slide 22 - Tekstslide

Slide 23 - Tekstslide

Slide 24 - Tekstslide

Slide 25 - Tekstslide

Slide 26 - Tekstslide


Again watch the vital part that is played by the number '1'!
Now it is on the bottom line(!) and 
it helps us going from 100 to 15 in a simple way.

Slide 27 - Tekstslide

HOMEWORK:
In this way do:
You only have to make:
16, 17, 18 and 19 from §6.2.               
However:  MAKE A RATION TABLE FOR EVERY EXERCISE!!
+ check your work with the Solutionsbook
+ take pics 
+ send in in GC

Slide 28 - Tekstslide