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Percentage change

Percentage change
 

 
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Slide 1: Diapositive
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

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Percentage change
 

 

Slide 1 - Diapositive

Planning
-  Review
- Learning objectives
- Introduction
- New theory
- Independent practice

Slide 2 - Diapositive

Learning objectives:
At the end of this lesson you will be able to:

  • Define and understand percentage change.
  • Calculate percentage increase and decrease.
  • Apply percentage change in real-life scenarios.

Slide 3 - Diapositive

Introduction
Example:
"If you bought a T-shirt for $20 last year, and now the price is $25, how much more are you paying now?"

Slide 4 - Diapositive

Percentage change
Definition:
Percentage change refers to the amount a value has increased or decreased, expressed as a percentage of the original value.

Slide 5 - Diapositive

Percentage change
Definition:
Percentage change refers to the amount a value has increased or decreased, expressed as a percentage of the original value.

change=​old​​(nw−old)​​⋅100

Slide 6 - Diapositive

Example 1:
If a price increased from $50 to $60, what’s the percentage increase?

Slide 7 - Diapositive

Example 1:
If a price increased from $50 to $60, what’s the percentage increase?
change=​old​​(nw−old)​​⋅100

Slide 8 - Diapositive

Example 1:
If a price increased from $50 to $60, what’s the percentage increase?
change=​old​​(nw−old)​​⋅100
change=​50​​(60−50)​​⋅100

Slide 9 - Diapositive

Example 1:
If a price increased from $50 to $60, what’s the percentage increase?
change=​old​​(nw−old)​​⋅100
change=​50​​(60−50)​​⋅100
The price increased with 20%

Slide 10 - Diapositive

Example 2:
A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?
change=​old​​(nw−old)​​⋅100

Slide 11 - Diapositive

Example 2:
A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?
change=​old​​(nw−old)​​⋅100
change=​15000​​(12000−15000)​​⋅100

Slide 12 - Diapositive

Example 2:
A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?
change=​old​​(nw−old)​​⋅100
change=​15000​​(12000−15000)​​⋅100
The population of the town decreased with 20%

Slide 13 - Diapositive

The temperature was 70°F, and now it's 80°F. What’s the percentage increase?

Slide 14 - Question ouverte

A store reduced the price of a jacket from $100 to $75. What’s the percentage decrease?

Slide 15 - Question ouverte

A student scored 80 out of 100 on a test, and later scored 90 out of 100. What’s the percentage increase in their score?

Slide 16 - Question ouverte

I can calculate percentage change
😒🙁😐🙂😃

Slide 17 - Sondage

Wat?
Maak som: # 81 t/m  84  blz. 40
                     # 88 t/m 90   blz. 42
waar?
blz. 40
Hulp?
-Boek en/of aantekeningen
-Buurtjonge/ buurtmeisje
-Docent
Klaar?
Controleer jouw antwoorden
Niet af?
Huiswerk
Aan de slag:

Slide 18 - Diapositive

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