1Th/vwo Ch 6 Ratio-show what you know!

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

Ch 5 Ratio

Rounding off this Chapter, you'll get some tasks,

to show what you've learned by now.

A little explanation, before and after the task, is also given,

to refresh your memory.

Please, use your calculator to solve the problems.

The topics we have had:

Decimal numbers            Rounding a result

How to use a calculator           Arithmetic in everyday situations Percentages       Calculations with percentages                              Ratios and ratio tables        Proportionality

Task 1:   Scale task.

Posters are made for the school party.

A beetle (kever) is drawn by you.

The picture is 110 cm long. The beetle is 0.55 cm long.

Key in the right scale in the next slide.

1. 1 : 200
2. 200 : 1
3. 1 : 20
4. 20 : 1

Solution Scale task:

The picture is 110 cm long. The beetle is 0.55 cm long. The key question is:

.... cm in the drawing is  ... cm in reality

Let's calculate how many times 0.55 cm fits in 110 cm.

110 : 0.55 = 11000 : 55  

As 55 fits two times  in 110, it fits two hundred times in 11000

So, the scale is         200 : 1           

Task 2: 

Send in a pic of your calculation (the ratio table!).

Key in the discount (reduction).

Solution Task 2:

Task 3:

.05

lKey in your answer in the next slide.

How good is your understanding of the ratio tables now?
On a scale of 1 to 10.

However,

This topic is to be understood completely before next Thursday.

We will have a test then

Homework time

Now finish the Homework for Monday

1. make the combined exercises

2. Check the answers

3. Fill in the table with the learning goals

4. Prepare the questions for the last two lessons.