1Thv Ch8 Negative Numbers + - X and :

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

Today

 Practice with what we learned in last lessons

-add and subtract negative numbers

 What are today's learning intentions

- multiply positive and negative numbers

- divide positive and negative numbers

We will also look back at and work on some exercises.

First...

- open your Notebook and Textbook

- show your teacher IF you made 48, 50 and 52

- also show your teacher HOW you made them;

   the POINT is that CALCULATIONS are NEEDED!

  WHY? Well, the tasks are pretty complicated,

  so it is important to work them out STEP by STEP!

1.Copy the 4 tasks and       48  

2. Work them out.

3.Finally write down

   the ANSWER.

COMPARE and CORRECT                  48

YOUR               

CALCULATIONS AND    

OUTCOMES !

1. COPY the tasks and                  50

2. WORK them OUT

Compare and correct

your WORK!

Now 1. Copy and 2.Work out these tasks:

NOTE: First WORK OUT the LEFT side and the RIGHT side. Only then choose for the correct sign!

50.

Compare your Calculations with these

and CORRECT your work!

What did we talk about last lesson?

How to 

- add a negative number 

- subtract a negative number 

Where do we see negative numbers in our daily lives?

Adding a negative number

3+−4=

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

Adding a negative number

3−−4=

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

Adding a negative number

−3+−4=

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

Subtracting a negative number

−3−−4=

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

Explanation multiplying negative numbers

Rules for multiplication

• When multiplying two numbers  with the same signs, the answer is always positive.
  
  
• When multiplying two numbers  with different signs, the answer is always negative.

Multiplying numbers
-5 x -4 =

1. 20
2. -20

Multiplying numbers
7 x -4 =

1. -28
2. 28

Multiplying numbers
-5 x 0 =

1. -5
2. 0

Explanation dividing negative numbers

Rules for division

• When dividing two numbers with the same sign, the answer is always positive.
  
  
• When dividing two numbers with different signs, the answer is always negative.

a negative number divided by a positive number equals

1. a positive number
2. a negative number

Dividing numbers
-28 : -4 =

1. -7
2. 7

Dividing numbers
-7 : 1 =

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

Lesson evaluation
Are you now able to multiply and divide negative numbers?

😒🙁😐🙂😃

Let's do some exercises