1TH/vwo Testing §8.1/2/3/4

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

This is a good lesson to...

Learn an Practice a lot more for tomorrows Test!

In order to prepare for 2T Ch9 ...

It is good to Practice a bit more with:

POSITIVE and NEGATIVE NUMBERS!

You don't have to write down anything,

just THINK about the tasks and ANSWER them!

After making §8/1/2/3/4  ...........

it's a good moment to Test Yourself!

-5 + -7 = ....
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. 12
2. -12
3. 2
4. -2

-5 + -7 = -12

 However, multiplying them is another story:

-5 x -7 = 35

-5 -6 x -3 =
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. 33
2. -13
3. 13
4. -33

-5 -6 x -3 = .....

First we do x, only then  +  or  -.

So:

-5 + 18 = 13

Also possible is this:

-5 - -18 = -5 +18 = 13

-72 : -9 = ...
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. 7
2. -7
3. 8
4. -8

-72 : -9 = 8

As we know (?),

a negative number divided by a negative number produces

a positive number!

In the next slide you have to

show your calculation!

-3 - 4 - 6 x 4 =

Solution:

Think about the order of operations!

-3 -4 -6 x 4 =

-7 - 24 =

-31

-24 : -6 + 12 x 3 =
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. 32
2. -40
3. 40
4. -32

Solution:

first : ,  then x and only then + !

-24 : -6 + 12 x 3 =

4 + 36 =

40

4 x .... -6 + 12 = 14
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. -1
2. 2
3. 1
4. -2

Solution:

4 x ..... -6 + 12 = 14           Because we work backwards, we now

                                                first calculate the addition:

4 x .....  + 6  = 14     

4 x .....    =    8           So the number that has to be filled in is:

      2  !

.... + 45 : -5 = -6.5
1st Copy this task in your Notebook
2. Work it out
3. Choose the right answer.

1. -2.5
2. -15.5
3. 2.5
4. 15.5

Solution:

......... + 45 : -5 = -6.5              First work out the division:

......... + -9 = -6.5                       So the number to be filled in is:

        2.5 !

Finally...

After all is said and done, more is said than done.

Look back critically at your results.

How did you really do?

If you think you did good, be a happy person.

If not, don't be unhappy, but:

PRACTISE some more with tasks from §8.1 t/m §8.4 !

Until you get better.

Carry on with your Homework, now.