# 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.

Lesduur is: 45 min

## Onderdelen in deze les

Chapter 9 Negative numbers

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

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

Dividing numbers
-28 : -4 =
A
-7
B
7

Dividing numbers
-7 : 1 =
A
-7
B
7
C
-1
D
1

Who's right?
Paulo says: 9
Sabine says: -9
A
Sabine
B
both
C
Paulo
D
neither

explanation:

#### Slide 15 -Tekstslide

-           = 25    (A)
-           = - 25   (B)
-           = - 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

=  .....

(4)3

(4)3
(4)3
(4)3
A
64
B
-64
C
-12
D
12

#### Slide 23 -Quizvraag

=  -4 x -4 x -4 = -64
(4)3

#### Slide 24 -Tekstslide

in the same way do:
=  ............
43

A
-64
B
-12
C
12
D
64

#### Slide 26 -Quizvraag

=        -   4 x 4 x 4 = -64
So, do               and
give the same outcome?!
Indeed, they do!!
43
(4)3
43