Percentages

• Economie
• Middelbare school
• havo
• Leerjaar 2

Answer these in your exercise books and then post a picture here H2a.
1. Duran says 'all goods are made'. Do you agree with him?
2. How do you calculate the income per capita of a country?
3. Write down one function of the Nederlandse Bank.
4. Complete: Coins and bank notes are examples of ________.

What are percentages?

A Primary Need

To compare the value of things that I can buy with 20E

The income per capita

These are examples of free goods

Food is

an example 

Using money as a calculating function

The average salary of an inhabitant of a country

A student to read

With the formula

With the formula

Rosa has 15 Euro to spend. She spends 3.48 at Allday. What percentage of ther 15 Euros does she spend at Allday?

7 student out of a class of 17 did not upload their maths homework yesteday. This make Mr Fisher sad.
What percentage DID upload their homework?

Ratio Tables

Multipliers

To change a decimal into a percentage we need to...

What is 32% as a decimal
(Do 32/100)

1. 32.0
2. 0.32
3. 0.23
4. 0.33

What is 52% as a decimal H2a?

1. 0.25
2. 0.052
3. 0.52
4. 52.00

What is 7% as a decimal?

1. 0.07
2. 0.7
3. 0.70
4. 7.70

What is 23.7% as a decimal H2a?

1. 32.7
2. 0.237
3. 0.327
4. 0.2370

What is 423% as a decimal?

1. 0.423
2. 4.32
3. 4.23
4. 1.23

Multipler ('perunage')

Change the PERCENTAGE to a decimal by dividing by 100 and then multiply them together

Examples    34% of 56 is 0.34 x 56 = 19.04

7% of 61 is 0.07 x 61 = 4.27

70% of 56 Euros is 0.70 x 56 = 39.2 so 39.20 Euros

An online lesson is 50 minutes long and students can concentrate in chunks of 12 minutes. For what percentage of a lesson can students concentrate? 

12% of 50 minutes 

- Formula

- Ratio table

- Perunage (% into a decimal and multiply)

So you have three methods to choose from

- Formula

- Ratio table

- Perunage (% into a decimal and multiply)

Your go...

Keywords: from students

Task: Percentages 1 questions on page 20