1TH/Vwo §2.3 Fractions

§2.3 Fractions
Today we do §2.3
You will refresh some OLD knowledge and learn a few NEW things about them.

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§2.3 Fractions
Today we do §2.3
You will refresh some OLD knowledge and learn a few NEW things about them.

Slide 1 - Diapositive

Slide 2 - Diapositive

Een deel berekenen
1/2 part of  10 you calculate like this:

Suppose this costs 10 euros.
What do you pay if you buy half of it?
Dividing 10 by 2 gives 5 euros.
And 1/4, how much does that cost you?
Dividing 10 by 4 gives   2  1/2  euros.




Slide 3 - Diapositive

Example:
1/10 part of 250
First take 1/10 of 250.
So divide 250 by 10. Like this:
250:10 = 25

Slide 4 - Diapositive

A little more difficult now:
3/5 part of 200
First calculate 1/5.
That is 200 : 5 = 40
Then do x 3, because you want to know 3/5 part.
So:
40 x 3 = 120

Slide 5 - Diapositive

1/6 part of 30
A
180
B
5
C
0,2
D
6

Slide 6 - Quiz

1/4 part of 80
A
0,05
B
320
C
20
D
2

Slide 7 - Quiz

Slide 8 - Diapositive

1/3 part of 18
A
6
B
0,166
C
54
D
8

Slide 9 - Quiz

1/10 part of 120
A
0,08
B
1,20
C
1200
D
12

Slide 10 - Quiz

4/5 part of 55
A
11
B
220
C
44
D
55

Slide 11 - Quiz

9/10 part of 300
A
30
B
270
C
33,33
D
180

Slide 12 - Quiz

1/3 x 24 = ...
the sign x means 'part of'
A
8
B
36
C
12
D
16

Slide 13 - Quiz

Homework time
Do §2.3 now.
- Make the tasks  21 t/m 29  (or choose the Challenge path)
- Open the Solutionsbook and
- Correct your work. How did you do?!

Slide 14 - Diapositive