# 1TTO §9.5 Powers of negative numbers PTI

To understand §9.5 better, we first shortly look back at Ch 8!
Powers are explained in a basic way, there.
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Slide 1: Slide
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This lesson contains 27 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

## Items in this lesson

To understand §9.5 better, we first shortly look back at Ch 8!
Powers are explained in a basic way, there.

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

explanation:

#### Slide 6 -Slide

-           = 25    (A)
-           = - 25   (B)
-           = 10     ( C )
-           = - 10     (D)    Fill in the good answer in the next slide.
52
52
52
52

#### Slide 7 -Slide

minus five squared equals ......

52
A
25
B
- 25
C
10
D
- 10

#### Slide 8 -Quiz

explanation:

-         =    -  5 x 5 = - 25
So the key to the answer is that only 5 is squared, but not
the minus sign!!
52

#### Slide 9 -Slide

A popular type of question now:
a Fotovraag!
Take your pen, pencil and eraser out of your pencil case and

#### Slide 10 -Slide

1.

2. Take a picture and send it in in the next side!
3. This is a task for ALL of you.

#### Slide 11 -Slide

everybody's Calculations:

#### Slide 12 -Open question

-10 x               =
-10 x( -8 x -8)
= -10 x       64 = -640
(8)2

#### Slide 13 -Slide

After all this squaring ......

+ we'll deal with higher powers too!

=  .....

(4)3

A
64
B
-64
C
-12
D
12

#### Slide 16 -Quiz

=  -4 x -4 x -4 = -64
(4)3

#### Slide 17 -Slide

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

A
-64
B
-12
C
12
D
64

#### Slide 19 -Quiz

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

#### Slide 21 -Slide

one more Fotovraag!

MAKE THIS ONE IN YOUR NOTEBOOK
TAKE A PICTURE AND SEND IT IN IN NEXT SLIDE
MAKE YOUR TEACHER PROUD AND YOURSELF TOO!

#### Slide 24 -Slide

HOMEWORK TIME
Now make §9.5:
exercises   43  t/m  47.
One final remark about 46 and 47 in next slide.

#### Slide 25 -Slide

As you can see, for 46 and 47 the CALCULATIONS are of the greatest importance!
So, when making them, don't just give the answers but show
all the steps it takes, to get the answer!

#### Slide 26 -Slide

Time for homework