Negative Numbers

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

Grab your stuff 

You have on your table:
- Your laptop (go to lessonup.app)

- Your grid notebook
- A pen to write with

- Your reader

Welcome

Today

- What did we talk about last lesson?

- Practice with what we learned in last lesson

- What are today's learning intentions?

- multiply positive and negative integers

- divide positive and negative integers

- Let's do some exercises 

-  No homework

What did we talk about last lesson?

How to 

- add a negative integer 

- subtract a negative integer 

(without using a number line)

Where do we see negative integers in our daily lives?

Adding a negative integer

−3+(−4)=

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

Subtracting a negative integer

−3−(−4)=

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

Adding a negative integer

3+(−4)=

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

Learning intentions

After this lesson you should be able to:

- multiply positive and negative integers

- divide positive and negative integers

Rules for multiplication

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

Multiplying integers
-5 x -4 =

1. 20
2. -20

Multiplying integers
7 x -4 =

1. -28
2. 28

Multiplying integers
-5 x 0 =

1. -5
2. 0

Rules for division

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

a negative integer divided by a positive integer equals

1. a positive integer
2. a negative integer

Dividing integers
-28 : -4 =

1. -7
2. 7

Dividing integers
-7 : 1 =

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

Lesson evaluation
Are you now able to multiply and divide integers?

😒🙁😐🙂😃

Let's do some exercises

What? On page 95 do exercises 1 and 4

 How? In pairs (whisper)
Time? 7 minutes
Help? Use your notes or raise your hand.

Finished? Do exercise 2 and 5

Lesson wrap up

What did we learn today?

- We learned how to multiply and divide integers