Intro percentages

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Good afternoon!

Schedule: 

• Learning goals 
• Percentages introduction
• Interchanging number forms
• Worksheet

Learning goals 

At the end of this lessons I can:

• Interchange between percentages, fractions and decimal numbers 
• Explain what a percentage is 

Think, Pair, Share!!

Percentages

1. Percentages compare a portion to a whole amount. 

What else compares a portion to a whole amount? 

2. The whole amount is represented by 100% 

What is a whole amount represented as a decimal number? 

And as a fraction? 

3. % is read as per cent which means 'in every Hundred'

Can you write 3% as a fraction? What about a decimal number? 

Percentages

1. Percentages compare a portion to a whole amount. 

What else compares a portion to a whole amount? 

Ratio's and fractions

2. The whole amount is represented by 100% 

What is a whole amount represented by in decimal number? 

And in fractions? 

Decimal: 1.0          Fractions:                                        a fraction where the numerator = the denominator

3. % is read as per cent which means 'in every Hundred'

Can you write 3% as a fraction? What about a decimal number? 

3% =                              3% = 0.03

​1,​​1​​​2,​​2​​​3,​​3​​​25,​​25​​etc

​100​​3​​

Percentages

As a general rule:       x % = 

​100​​x​​

Drag the correct percentage to the progress bar

95% complet

40% complete

7% complete

50% complete

Interchanging number forms

Worksheet 

Complete the rest of the worksheet table. 

Done? 
- Spinner challenge worksheet 

or 

- Substracting/adding worksheet 

You can find these on ManageBac

Around                      people in the world are from the Netherlands. 

Find (with your calculator) the decimal equivalent of the number of dutch people in the world. 

What is the percentage of dutch people in the world? 

​8000​​176​​