Negative Numbers

Chapter 9 Negative numbers
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Slide 1: Tekstslide
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In deze les zitten 31 slides, met interactieve quizzen en tekstslides.

time-iconLesduur 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 positive.

  • 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.
52
52
52
52

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!
52

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:
=  ............
43

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!!        
43
(4)3
43

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