Negative Numbers

• 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

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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