1TH/V §5.2 Percentages-NEW!

§5.2 Percentages
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Slide 1: Tekstslide
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In deze les zitten 35 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 50 min

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§5.2 Percentages

Slide 1 - Tekstslide

Question:
What will be used in both situations?
(Think back of §5.1 !)
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

Do the following exercise.
+ Open your Notebook
+ Take your pen, pencil and geo triangle
+ Watch the next slide! 
+ Try the exercise yourself.
+ Then you will send in your Solution by a FOTOVRAAG !
+ Finally I will show you the 'official' solution'.
 

Slide 16 - Tekstslide

Apply what you just learned,
in exercise 9.
Finished? Picture The Ratio Table that you filled in.
Take a picture and send it in in the next slide!
timer
2:30

Slide 17 - Tekstslide

here's my solution:

Slide 18 - Open vraag

Solution exercise 9:

Slide 19 - Tekstslide

Now work for yourself on § 5.2 (= homework).

+ Make RATIO TABLES for every exercise! However ...
+ For some exercises you can make use of the Ratio Tables in your book'
   filling them in further:   10, 13 and 14 
+ No calculator; work it all out on paper and in your head.
+ Skip 9, 12 and 16
+ 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 13 on it's the other way around.
+ Now we will calculate the AMOUNT, UP in the table!
+ Follow the coming example carefully.

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

Some new words will be explained!.
Go to the WORD section in your Notebook!
Copy the new words that follow now.

Slide 28 - Tekstslide

COPY:    sweaters on display - sweaters that you can see

Slide 29 - Tekstslide

VAT  (English)= BTW (in Dutch)
VAT = Value added tax                                  Copy the yellow lines!
When you buy something you have to be pay a tax, sadly enough. 
In exercise 17 this VAT plays a role. See next slide.

Slide 30 - Tekstslide




COPY :         -   a broken exhaust  -  een kapotte uitlaat
                       -   a purchase  - something you buy (=  een aankoop)

Slide 31 - Tekstslide

COPY:
it costs 400 euros excluding VAT - het kost 400 euros zonder BTW

Slide 32 - Tekstslide

HOMEWORK:  §5.2

 Only make:       9, 12, 16 and            
However:  MAKE A RATIO TABLE FOR EVERY EXERCISE!!
Next 2 slides show you an EXAMPLE for this!
+ check your work with the Solutionsbook


Slide 33 - Tekstslide

When you are doing 11a, use the METHOD you learnt:
Make a RATIO TABLE, although the writer does NOT ask for this. 
However, your teacher DOES! 
Try to IMAGINE a good ratio table now. Next slide shows it.
timer
0:45

Slide 34 - Tekstslide

Below you see what you are meant to do:
a RATIO TABLE with on top the amounts; below the percentages.

Slide 35 - Tekstslide