2TH §3.2 Calculating with a scale factor

§3.2 Calculating with a scale factor
First a refresh on §3.1 !

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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 21 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 45 min

Items in this lesson

§3.2 Calculating with a scale factor
First a refresh on §3.1 !

Slide 1 - Slide

§4.2 Calculating with a scale factor



THE SCALE FACTORS HERE ARE:
0.5  AND  3.

Slide 2 - Slide

A RECAP on RATIO TABLES ...

Slide 3 - Slide

Slide 4 - Slide

Slide 5 - Slide

Let us start with §3.2 now!
- open your Notebook and 
- open your Textbook, p.102/103
- get a pen, pencil, geo or ruler ready
- we're going to do a Homework exercise together, 
  this will save you time to do it yourself at home  
- WRITE DOWN IN THE MARGIN: 8a        

Slide 6 - Slide

Exercise 8
Exercise 8

Slide 7 - Slide

ANS

Slide 8 - Slide

Figure ...
A
A
B
B
C
C
D
D

Slide 9 - Quiz

Slide 10 - Slide

SOLUTION 8a:         B, because the angles are different from A.
Write this in your Notebook!

Slide 11 - Slide



Now do 8b     
Write down '8b' in the margin and
answer the next slide.

Slide 12 - Slide

A division for this task could be:
timer
1:00
A
2.5 : 7
B
4.2 : 1.5
C
7 : 2.5
D
1.5 : 4.2

Slide 13 - Quiz



Solution to 8b:   7 : 2.5   and also   4.2 : 1.5
Write this in your Notebook!

Slide 14 - Slide


Now ..... gets the turn!
What is your answer to 8c?
By the way,  give the scale factor as 
one number!

Slide 15 - Slide


Let's all write down the Solution in our Notebook:
8c  4.2 : 1.5 = 2.8     or    7 : 2.5 = 2.8

Slide 16 - Slide

timer
3:00

Slide 17 - Slide

Solutions 8d and 8e:

Slide 18 - Slide

Slide 19 - Slide

Homework time 
- Do exercises 9, S10, 10, 11, 12 and 13  (§3.2 Calculating with a scale factor)
  
-  Check with another colour and with the Solutionsbook
- Take a few pics and upload them in Classroom

Slide 20 - Slide

After this lesson, what question do you still have?

Slide 21 - Mind map