1Tvwo §8.6 Mixed exercises(2)

Let's read this exercise first.

Please read out to us, .............. !

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Slide 1: Slide

WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 20 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

Items in this lesson

Let's read this exercise first.

Please read out to us, .............. !

Slide 1 - Slide

Question: What is an 'adjacent square'?

Answer: Adjacent squares are next to one another, or on top of one another.

For example: 1 and -3, or 2 and -1.

Slide 2 - Slide

Question: Why cannot we move from 1 to 3 ?

Answer this in the next slide.

Slide 3 - Slide

My answer: .............

Slide 4 - Mind map

Question: Why cannot we move from 1 to 3 ?

Answer: Because we are not allowed to move 'diagonally'!

Slide 5 - Slide

This is a FOTOVRAAG!

So:

+ Work it out in your Notebook and then

+ choose for the 'greater than' or 'smaller than' sign.

+ finally take a pic and send it in, in the next slide!

+ this is a Task for all!

Slide 6 - Slide

-7.5 x -6 ........ -17 -

(- 5)^{​ 2 ​ ​}

Slide 7 - Open question

Solution:

-7 x -6 = 45 -17 - = -17 - 25 = - 42

So the sign for 'greater than' has to be used!

\frac{​ 1 ​ ​}{​ 2 ​}

(- 5)^{​ 2 ​ ​}

Slide 8 - Slide

As you can see, the numbers are multiplied by each other.

Which is the only number you can fill in now?

Fill in in the next slide.

Slide 9 - Slide

The number to be filled in is ...

Slide 10 - Mind map

Slide 11 - Slide

Solution:

2 x 3 = 6, 3 x -6 = -18 and -1 x -3 = 3, so

6, -6 and -1 are the numbers to be filled in.

Slide 12 - Slide

Question: which numbers can you fill in ?
Give your answer in the next slide.

Slide 13 - Slide

The number you can fill in is .....

Slide 14 - Mind map

This is called:

a Magic Square.

Try to find out what makes it 'magic' and explain this in the next slide!

Slide 15 - Slide

It's a magic square, because ...

Slide 16 - Mind map

There is a strong regularity (= regelmaat) in it:

Horizontal: Vertical: Diagonally:

4 + -6 + 8 = 6 4 + 6 + -4 = 6 4 + 2 + 0 = 6

6 + 2 + -2 = 6 -6 + 2 + 10 = 6 -4 + 2 + 8 = 6

-4 + 10 + 0 = 6 8 + -2 + 0 = 6

Slide 17 - Slide

Homework:

Do §9.6:

48, 49 and 52

It's only 3 exercises, but do them good!

As far as 49 is concerned, watch the following slide.

Slide 18 - Slide

First write down your Calculations of both sides of a task.

Only then write down the 'greater than' or 'smaller than' sign!

So not just the answer.

Slide 19 - Slide

Slide 20 - Slide