What is LessonUp
Search
Channels
Log in
Register
‹
Return to search
1TH/Vwo §2.4 Decimal numbers
1 / 22
next
Slide 1:
Slide
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
This lesson contains
22 slides
, with
interactive quizzes
and
text slides
.
Lesson duration is:
50 min
Start lesson
Save
Share
Print lesson
Items in this lesson
Slide 1 - Slide
§ 2.4 Decimal numbers
Some important points follow now!
Slide 2 - Slide
Fractions - decimal numbers
These are closely linked together!
We can write a fraction as a decimal number:
= 0.8, or
= 0.75
5
4
4
3
Slide 3 - Slide
In order to write a fraction as a decimal number,
we first have to write the fraction with a denominator of 10, 100 or even 1000!
For example:
5 = 5 = 5.85
= = = 0.175 Now try yourself!
2
0
1
7
4
0
7
1
0
0
8
5
2
0
0
3
5
1
0
0
0
1
7
5
1
0
0
8
5
Slide 4 - Slide
3
0
6
Task 1: Write as a decimal number:
Slide 5 - Mind map
Task 1 Explanation:
We have to have a number like 10, 100 or 1000 as a denominator!
= = = 0.2
3
0
6
5
1
1
0
2
Slide 6 - Slide
2
5
0
3
Task 2:
Write as a decimal number:
Slide 7 - Mind map
Task 2 Explanation:
Now we even need to have 1000 as a denominator!
= = 0.012
2
5
0
3
1
0
0
0
1
2
Slide 8 - Slide
Slide 9 - Slide
Rounding off can give us a better overview:
For example:
If you read in the papers that
'298 785 sheep were transported,
it makes sense to round this off:
'About 300 thousand sheep were transported.'
Slide 10 - Slide
Rounding off ... (1)
see next slide how to do this!
Slide 11 - Slide
Rounding off ... (2)
Your marks are also rounded off at the end of the year:
+ 7.79 for French become a 7.8 on your report
+ 5.73 for History becomes a 5.7 on your report
How does this work? Let's have a closer look!
Slide 12 - Slide
Round to two decimal numbers:
4.7386
Slide 13 - Slide
Slide 14 - Slide
4.73 86
Rule for rounding off:
If the number to the right of 3 is '5 or higher', then 3 is made one higher.
In this case: 8 is certainly '5 or higher', so the rounded number is: 4.74
So you see: the 3 turns into a 4!
Slide 15 - Slide
4.7386 .......
becomes 4.74,
because the '8', after the '3', is higher than 4.
Slide 16 - Slide
Task 3: Round to two decimal places:
79.6754
Slide 17 - Mind map
This is how it should've been done:
79.6754 79.68
Because 5 is '4 or more', the 7 is made one higher!
≈
Slide 18 - Slide
Slide 19 - Slide
Slide 20 - Slide
Slide 21 - Slide
Homework time
+ now do §2.4 Decimal numbers
+ check your work with the Solutionsbook
+ take pictures of your Homework and
+ send them in in Google Classroom
Slide 22 - Slide
More lessons like this
1Vab Ch 3 Numbers
September 2020
- Lesson with
45 slides
Wiskunde
Middelbare school
vwo
Leerjaar 1
lesson 1 THV2
September 2020
- Lesson with
18 slides
Wiskunde
Middelbare school
havo, vwo
Leerjaar 2
1TH/vwo §7.4 Adding and subtracting fractions
February 2021
- Lesson with
28 slides
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
1Tvwo Ch 9 §9-4 The calculator
April 2017
- Lesson with
34 slides
Wiskunde
Middelbare school
vwo
Leerjaar 1
1TH/V Ch7: Refresh, §7.1, 7.2 and 7.3
February 2021
- Lesson with
34 slides
Wiskunde
Middelbare school
vwo
Leerjaar 1
1TH/Vwo §7.5 multiplying fractions
February 2021
- Lesson with
38 slides
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
1TH/Vwo §7.6 Calculating with percentages.
February 2021
- Lesson with
15 slides
Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
1TH/Vwo Ch7 Fractions
November 2016
- Lesson with
24 slides
Wiskunde
Middelbare school
vwo
Leerjaar 1