Percentage change

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Slide 1: Slide

WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 18 slides, with interactive quizzes and text slides.

Lesson duration is: 30 min

Items in this lesson

Percentage change

Slide 1 - Slide

Planning

- Review

- Learning objectives

- Introduction

- New theory

- Independent practice

Slide 2 - Slide

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 - Slide

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 - Slide

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 - Slide

Percentage change

Definition:

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

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

Slide 6 - Slide

Example 1:

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

Slide 7 - Slide

Example 1:

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

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

Slide 8 - Slide

Example 1:

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

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

c h a n g e = \frac{​ ( 6 0 - 5 0 ) ​ ​}{​ 5 0 ​} \cdot 100

Slide 9 - Slide

Example 1:

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

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

c h a n g e = \frac{​ ( 6 0 - 5 0 ) ​ ​}{​ 5 0 ​} \cdot 100

The price increased with 20%

Slide 10 - Slide

Example 2:

A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

Slide 11 - Slide

Example 2:

A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

c h a n g e = \frac{​ ( 1 2 0 0 0 - 1 5 0 0 0 ) ​ ​}{​ 1 5 0 0 0 ​} \cdot 100

Slide 12 - Slide

Example 2:

A population of a town was 15,000, and now it is 12,000. What is the percentage decrease?

c h a n g e = \frac{​ ( n w - o l d ) ​ ​}{​ o l d ​} \cdot 100

c h a n g e = \frac{​ ( 1 2 0 0 0 - 1 5 0 0 0 ) ​ ​}{​ 1 5 0 0 0 ​} \cdot 100

The population of the town decreased with 20%

Slide 13 - Slide

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

Slide 14 - Open question

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

Slide 15 - Open question

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 - Open question

I can calculate percentage change

😒🙁😐🙂😃

Slide 17 - Poll

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 - Slide

Percentage change

Items in this lesson

Slide 1 - Slide

Slide 2 - Slide

Slide 3 - Slide

Slide 4 - Slide

Slide 5 - Slide

Slide 6 - Slide

Slide 7 - Slide

Slide 8 - Slide

Slide 9 - Slide

Slide 10 - Slide

Slide 11 - Slide

Slide 12 - Slide

Slide 13 - Slide

Slide 14 - Open question

Slide 15 - Open question

Slide 16 - Open question

Slide 17 - Poll

Slide 18 - Slide

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