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Negative Numbers
Chapter 9 Negative numbers
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Slide 1:
Tekstslide
Wiskunde
Middelbare school
mavo, havo, vwo
Leerjaar 1
In deze les zitten
31 slides
, met
interactieve quizzen
en
tekstslides
.
Lesduur is:
45 min
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Chapter 9 Negative numbers
Slide 1 - Tekstslide
Adding a negative number
−
3
+
(
−
4
)
=
A
-1
B
1
C
-7
D
7
Slide 2 - Quizvraag
Subtracting a negative number
−
3
−
(
−
4
)
=
A
-1
B
1
C
-7
D
7
Slide 3 - Quizvraag
Adding a negative number
3
+
(
−
4
)
=
A
-1
B
1
C
-7
D
7
Slide 4 - Quizvraag
Rules for multiplication
When multiplying two numbers with the
same
signs
, the answer is always
positive.
When multiplying two numbers with
different
signs,
the answer is always
negative.
Slide 5 - Tekstslide
Multiplying numbers
-5 x -4 =
A
20
B
-20
Slide 6 - Quizvraag
Multiplying numbers
7 x -4 =
A
-28
B
28
Slide 7 - Quizvraag
Multiplying numbers
-5 x 0 =
A
-5
B
0
Slide 8 - Quizvraag
Rules for division
When dividing two numbers with the
same
sign, the answer is always
positiv
e.
When dividing two numbers with
different
signs, the answer is always
negative.
Slide 9 - Tekstslide
a negative number divided by a positive number equals
A
a positive number
B
a negative number
Slide 10 - Quizvraag
Dividing numbers
-28 : -4 =
A
-7
B
7
Slide 11 - Quizvraag
Dividing numbers
-7 : 1 =
A
-7
B
7
C
-1
D
1
Slide 12 - Quizvraag
Task 1:
Key in your answer in the next slide!
Slide 13 - Tekstslide
Who's right?
Paulo says: 9
Sabine says: -9
A
Sabine
B
both
C
Paulo
D
neither
Slide 14 - Quizvraag
explanation:
Slide 15 - Tekstslide
Task 2:
- = 25 (A)
- = - 25 (B)
- = 10 ©
- = - 10 (D) Fill in the good answer in the next slide.
5
2
5
2
5
2
5
2
Slide 16 - Tekstslide
minus five squared equals ......
A
25
B
- 25
C
10
D
- 10
Slide 17 - Quizvraag
minus five squared equals ......
A
25
B
- 25
C
10
D
- 10
Slide 18 - Quizvraag
explanation:
- = - 5 x 5 = - 25
So the key to the answer is that only 5 is squared, but not
the minus sign!!
Time for a bit of Theory!
5
2
Slide 19 - Tekstslide
Slide 20 - Tekstslide
Slide 21 - Tekstslide
Task 3:
= .....
Fill in your answer in the next slide, again.
(
−
4
)
3
Slide 22 - Tekstslide
(
−
4
)
3
(
−
4
)
3
(
−
4
)
3
A
64
B
-64
C
-12
D
12
Slide 23 - Quizvraag
Explanation Task 3:
= -4 x -4 x -4 = -64
(
−
4
)
3
Slide 24 - Tekstslide
Task 4:
in the same way do:
= ............
−
4
3
Slide 25 - Tekstslide
Task 4:
A
-64
B
-12
C
12
D
64
Slide 26 - Quizvraag
Explanation Task 4:
= - 4 x 4 x 4 = -64
So, do and
give the same outcome?!
Indeed, they do!!
−
4
3
(
−
4
)
3
−
4
3
Slide 27 - Tekstslide
Slide 28 - Tekstslide
Think hard about this one:
Slide 29 - Tekstslide
This is the Solution:
Slide 30 - Tekstslide
Start prepare for the test:
Test yourself or
Extra exercises or
Practice test (in your workbook)
Slide 31 - Tekstslide
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