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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
2
1
1 / 16
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Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
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interactive quizzes
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Lesson duration is:
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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
2
1
Slide 1 - Slide
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 - Slide
Slide 3 - Slide
Slide 4 - Slide
6.6 - 4 x 1.5 =
timer
0:30
A
6
B
3.9
C
-0.6
D
0.6
Slide 5 - Quiz
explanation:
First comes X and only then we do -, so:
6.6 - 4 x 1.5 =
6.6 - 6 = 0.6
Slide 6 - Slide
Slide 7 - Slide
Slide 8 - Slide
5.6 x 0.01 = ....
A
5600
B
0.56
C
0.056
D
560
Slide 9 - Quiz
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
1
0
0
1
Slide 10 - Slide
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 - Slide
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 - Slide
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!
8
2
Slide 13 - Slide
VWO task
Send in a pic of your CALCULATION!
4
.
2
+
(
8
2
−
2
8
)
=
timer
2:00
Slide 14 - Open question
Explanation:
4.2 + ( - 28) = Brackets first.
4.2 + (64 - 28) = Between the brackets: the power first.
4.2 + 36 =
40.2
8
2
Slide 15 - Slide
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 - Slide
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