1TH/Vwo §8.6 Calculating with percentages.


Some explanations and a few tasks for you too!
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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 15 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 30 min

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Some explanations and a few tasks for you too!

Slide 1 - Tekstslide

Slide 2 - Tekstslide

Slide 3 - Tekstslide

Slide 4 - Tekstslide

Slide 5 - Tekstslide

Slide 6 - Tekstslide

timer
0:30
write 33 % as a fraction

Slide 7 - Woordweb

explanation:
33 %  is  33 of 100, so  it is:
Common mistake:
33 % =  
This is wrong, because :
                                             %

10033
31
31=3331

Slide 8 - Tekstslide

FOTOVRAAG:      write as a percentage:
A difficult one!
Think about it!
Work out in your Notebook.
Take a pic and send it in in the next slide.
Who will be succesful?!

Slide 9 - Tekstslide

= ............ %
25082
timer
1:00

Slide 10 - Open vraag

written as a percentage:
This is the same as :
82 x 4     divided by        4 x 250 = 1000,  so it is
, which is the same as                               , so it is:
32.8 %  !

25082
1000328
10032.8

Slide 11 - Tekstslide

The final exercise is about the relations between
decimal numbers, percentages and fractions.

Slide 12 - Tekstslide

Write 92.5 % as a decimal number:
timer
0:25
A
9.25
B
92.5
C
0.925
D
0.93

Slide 13 - Quizvraag

Explanation:
92.5 %  is the same as 92.5 of 100, or:
0.925
The method here is: 
from a percentage to a decimal number means replacing the point
two places to the left! Just like: 25 % is 0.25

Slide 14 - Tekstslide

Homework time
Make §8.6 now. You may skip exercise 46.
A1X and G1X: make C14 and C15 too, skipping 48 and 51
Again send in the lot in GC, after having corrected with the 
Solutionsbook!

Slide 15 - Tekstslide