1TH/Vwo §7.3 Decimal numbers

§7.3 Decimal numbers
You all know about decimal numbers.
It is similar to fractions, but now written with a point and not with a fraction symbol.
So:   0.5    instead of   
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Slide 1: Tekstslide
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In deze les zitten 16 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 30 min

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§7.3 Decimal numbers
You all know about decimal numbers.
It is similar to fractions, but now written with a point and not with a fraction symbol.
So:   0.5    instead of   
21

Slide 1 - Tekstslide

The same 'order of operations' as you learnt applies now!
And you can take the
+ sum
+ difference
+ product and 
+ quotient  again!
+ above all the brackets 'rule' again, having top priority!

Slide 2 - Tekstslide

Slide 3 - Tekstslide

Slide 4 - Tekstslide

6.6 - 4 x 1.5 =
timer
0:30
A
6
B
3.9
C
-0.6
D
0.6

Slide 5 - Quizvraag

explanation:
First comes X  and only then we do  -,  so:

6.6 - 4 x 1.5 =
6.6 - 6 = 0.6

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Slide 8 - Tekstslide

5.6 x 0.01 = ....
A
5600
B
0.56
C
0.056
D
560

Slide 9 - Quizvraag

explanation:
multiplying by 0.01 is the same as taking 
of that number, or placing the decimal point 2 places to the left, so:
5.6 x 0.01 = 0.056
 
1001

Slide 10 - Tekstslide

Finally a remark about exercise 25:
In 25 the calculations have become that complicated, that it is important to work them out in a few steps!
Look at the following example.

Slide 11 - Tekstslide

This becomes pretty tricky, reason for us to work it out on paper like this:
0.1 x 14 x 100 = 1.4 x 100 = 140
So first the brackets, then the square and finally the 2 multiplications!

Slide 12 - Tekstslide

One more TASK:
      4.2 + (      - 28) =
+ Copy this task in your Notebook
+ write down the CALCULATION and only then the ANSWER
+ take a picture and 
+ send it in in the FOTOVRAAG!

82

Slide 13 - Tekstslide

VWO task
Send in a pic of your CALCULATION!


4.2+(8228)=
timer
2:00

Slide 14 - Open vraag

Explanation:
4.2 + (      - 28)  =               Brackets first.
4.2 + (64 - 28) =               Between the brackets: the power first.
4.2 + 36  =   
40.2                        


82

Slide 15 - Tekstslide

Homework time
do § 7.3 now 
you may skip:  18  and  19
however, don't forget to WORK OUT exercise 25, so don't 
only give the answers!

Slide 16 - Tekstslide