Percentage change

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

Percentage change
 

 

Planning

-  Review

- Learning objectives

- Introduction

- New theory

- Independent practice

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.

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?"

Percentage change

Definition:

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

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

Example 1:

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

Example 1:

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

change=​old​​(nw−old)​​⋅100

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

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%

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

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

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%

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

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

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?

I can calculate percentage change

😒🙁😐🙂😃

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

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