# 1TH/vwo §8.2 Adding negative numbers

12   t/m   16
LEARNING GOAL:
How to add NEGATIVE NUMBERS together
1 / 35
Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 35 slides, met interactieve quizzen en tekstslides.

Lesduur is: 30 min

## Onderdelen in deze les

12   t/m   16
LEARNING GOAL:
How to add NEGATIVE NUMBERS together

#### Slide 1 -Tekstslide

We're gonna do some adding ...
with Positive and especially Negative Numbers!

#### Slide 2 -Tekstslide

As usual...
this LessonUp marches through the most
important aspects of the whole paragraph,
making it much easier to deal with it yourself, afterwards!
We're gonna do several exercises together, so: less homework.

#### Slide 3 -Tekstslide

A special role is reserved today for a peculiar, be it somewhat creepy, person: A Witch!

#### Slide 4 -Tekstslide

The witch is toying with her
HOT BLOCKS and COLD BLOCKS!

#### Slide 5 -Tekstslide

How does this work?!           Like this:

#### Slide 6 -Tekstslide

The witch has a cauldron. (=kettle)
You better not taste one of her brews (brouwsels)...
+ she puts in HOT BLOCKS and also
+ COLD BLOCKS
+ to control the temperature
+ every Blocks represents one degree!

#### Slide 7 -Tekstslide

The temperature is 0 degrees.
The witch adds 5 cold blocks. (1 block = 1 degree)
What's the new temperature?
A
5 degrees
B
+5 degrees
C
-5 degrees
D
0 degrees

#### Slide 8 -Quizvraag

There are 13 cold blocks and 7 hot blocks in the cauldron.
What is the temperature?
A
-6 degrees
B
6 degrees
C
20 degrees
D
-20 degrees

#### Slide 9 -Quizvraag

Explanation:
13 cold blocks correspond to -13 degrees
7 hot blocks correspond to +7 degrees,
so the calculation is:
-13 + 7 = -6

#### Slide 10 -Tekstslide

In the next slide...
+ many changes in temperature come up!
+ your teacher will tackle the first line
+ then all think about the next line
+ one of you will get the turn!
+ and so on with the 3rd line, etcetera

#### Slide 12 -Tekstslide

That may all be true, but ...
it's high time for a Joke!

#### Slide 15 -Tekstslide

What's this?!
Do I see a '+' and a '-' in a row?
Yes, you do. The '+' is for 'adding' and the '-' is for the negative number: '-7'.

#### Slide 17 -Tekstslide

Next slide ...
+ offers us a huge table again
+ your teacher will take care of the first line again
+ then some of you get the turn to tackle the next lines
+ maybe youthink it's all still very simple(?)
+ beware: next lesson the Witch will also TAKE OUT Hot en Cold Blocks;
+ so it's important to understand the ADDING of Blocks first!

#### Slide 19 -Tekstslide

Not really surprising, this, but good to realise!

#### Slide 20 -Tekstslide

(This is a snapshot from exercise 14)

Solution:
-35 + 40 = 5

#### Slide 22 -Tekstslide

-6 + .... =  -9
What to fill in here?
Fill in in the next slide!

timer
0:30
-6 + .... = -9

#### Slide 24 -Woordweb

-6 + ...... = -9
The number to be filled in is:
-3 !

#### Slide 26 -Tekstslide

Finally:

An example of this follows!

#### Slide 27 -Tekstslide

What all this?!?
Negative numbers and Fractions too!
This is too difficult for me, Mr. Hauwert!
Okay, next slide shows you a fine way to tackle such ones!

VWO only

1352
timer
1:20
+ ... = -2.5

#### Slide 31 -Woordweb

VWO only
Using the number line, you that you have to
add up the length from 13        till 0,
and the length from 0 to -2.5 !
That is:   13       +   2         =     15

However we go from positief to negative,
so we subtract. The answer is:  -15.9
52
52
105
109

#### Slide 32 -Tekstslide

Homework time
Make:       12, 13, 14, 15, 16. plus

Check your Homework, then take pics
and send them in in GC.

#### Slide 33 -Tekstslide

TIP 1:
in order to make the Graph, first make a TABLE!
Taking the three numbers. 0, 4 and 8 for 'number of buttons' is enough.
(The Solutionsbook takes many more...)

#### Slide 34 -Tekstslide

Feel free to make this task