1tto check H9 negative numbers par 1-3

This lessonup is meant as a check of calculating with negative numbers 
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Slide 1: Diapositive

Cette leçon contient 21 diapositives, avec quiz interactifs et diapositives de texte.

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This lessonup is meant as a check of calculating with negative numbers 

Slide 1 - Diapositive

If you walk to the right you add 
If you walk to the left you subtract (-)
If you add or subtract a postive number you walk forwards
If you add or subtract a negative number you walk backwards
Look at the picture on the right. 
If you add a number you turn your nose to the right

If you subtract a number you turn your nose to the left

If you add or subtract a positive number you walk forwards

If you add or subtract a negative number you walk backwards

Slide 2 - Diapositive

If you walk to the right you add 
If you walk to the left you subtract (-)
If you add or subtract a postive number you walk forwards
If you add or subtract a negative number you walk backwards
Adding (walk to the right) a positive number  (walking forwards)
8 + 6 = 14 

Slide 3 - Diapositive

If you walk to the right you add 
If you walk to the left you subtract (-)
If you add or subtract a postive number you walk forwards
If you add or subtract a negative number you walk backwards
Subtracting (nose to the left) a negative number (walk backwards).
If you stand at position 8 on the number line, nose to the left and you walk backwards 6 steps you end up at 14.
8 - -6 = 14 

Slide 4 - Diapositive

We can see that both examples have the same answer:
8 + 6 = 14   and also
8 -  -6 = 14 

Conclusion: subtracting a negativen number is the same as adding a positive number !!!


Slide 5 - Diapositive

By the way....

The brackets around -6 in the picture are not necessary (nodig) but are just to clarify that the negative minus belongs to the 6. In class we will not write these brackets

Slide 6 - Diapositive

Now let's start practising...make the next exercises and fill in your answer. Important, if your answer is a negative number do not write a space in between the minus sign and the number. 
Now let's start practising with the next exercises. There is an automatic check if your answer is correct. This will only work if you do not write a space between a negative sign and the number. For example, if  your answer is minus 5 just typ -5 and not:  -  5 . Okay? :D

Slide 7 - Diapositive

10 - 12

Slide 8 - Question ouverte

30 + -12

Slide 9 - Question ouverte

5 - 17 =

Slide 10 - Question ouverte

-8 - 14 =

Slide 11 - Question ouverte

-3 - 5 =

Slide 12 - Question ouverte

4 - -11=

Slide 13 - Question ouverte

-10 - -4 =

Slide 14 - Question ouverte

-20 - 8=

Slide 15 - Question ouverte

31 + -50

Slide 16 - Question ouverte

14 - -10=

Slide 17 - Question ouverte

8 + -9=

Slide 18 - Question ouverte

-7 - -7 =

Slide 19 - Question ouverte

How are you doing? Would you like more explanation and practising on this section or not?
I find it difficult and need more explanation/practising
I'm doing quite all right, I get it and I am ready to move on!

Slide 20 - Sondage

If your answer to the previous question was: I need more instruction, then your homework will be to make the support exercises: S10 and S13 on page 55 and S18, S21 and S23 on page 59.

If your answer was that you understood everything your homework will be the challenge exercises:  C3 and C4 on page 55 and C5 and C6 on page 59.

Slide 21 - Diapositive