1TTO §8.2 Adding negative numbers 23-24

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

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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 20 slides, met interactieve quizzen en tekstslides.

Lesduur is: 30 min

Onderdelen in deze les

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

Slide 1 -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 2 -Tekstslide

A cauldron (ketel)
+ she puts in HOT BLOCKS and also
+ COLD BLOCKS
+ to control the temperature
+ (every Blocks represents one degree!)
+ if there are just as many Hot blocks as there are Cold Blocks,
+ then the temperature is 0 degrees.

Slide 3 -Tekstslide

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

Slide 4 -Quizvraag

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

Slide 5 -Quizvraag

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

Slide 6 -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

Exercise 9

Slide 10 -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 11 -Tekstslide

Not really surprising, this, but good to realise!

Slide 12 -Tekstslide

Starting value is -35......
Solution:
-35 + ...... = 5

Slide 13 -Tekstslide

Finally:

An example of this follows!

Slide 14 -Tekstslide

Draw a numberline and find the missing number

Slide 16 -Tekstslide

Next slide will provide us with the Solution!

Slide 17 -Tekstslide

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

Homework time

Evaluation