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1TH/Vwo §7.6 Calculating with percentages.
Some explanations and a few tasks for you too!
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Slide 1:
Slide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
This lesson contains
15 slides
, with
interactive quizzes
and
text slides
.
Lesson duration is:
30 min
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Items in this lesson
Some explanations and a few tasks for you too!
Slide 1 - Slide
Slide 2 - Slide
Slide 3 - Slide
Slide 4 - Slide
Slide 5 - Slide
Slide 6 - Slide
timer
0:30
write 33 % as a fraction
Slide 7 - Mind map
explanation:
33 % is 33 of 100, so it is:
Common mistake:
33 % =
This is wrong, because :
%
1
0
0
3
3
3
1
3
1
=
3
3
3
1
Slide 8 - Slide
FOTOVRAAG: write as a percentage:
A difficult one!
Think about it!
COPY and WORK it Work out in your Notebook.
Take a pic of YOUR WORK and send it in in the next slide.
Who will be succesful?!
Slide 9 - Slide
= ............ %
2
5
0
8
2
timer
1:00
Slide 10 - Open question
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 % !
2
5
0
8
2
1
0
0
0
3
2
8
1
0
0
3
2
.
8
Slide 11 - Slide
The final exercise is about the relations between
decimal numbers, percentages and fractions.
Slide 12 - Slide
Write 92.5 % as a decimal number:
timer
0:25
A
9.25
B
92.5
C
0.925
D
0.93
Slide 13 - Quiz
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 - Slide
Homework time
Make §7.6 now. You may skip exercise 44.
Slide 15 - Slide
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