# 1TH/Vwo §7.6 Calculating with percentages.

Some explanations and a few tasks for you too!
1 / 15
Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 15 slides, with interactive quizzes and text slides. Lesson duration is: 30 min

## Items in this lesson

Some explanations and a few tasks for you too!

#### Slide 6 -Slide

timer
0:30
write 33 % as a fraction

#### Slide 7 -Mind map

explanation:
33 %  is  33 of 100, so  it is:
Common mistake:
33 % =
This is wrong, because :
%

10033
31
31=3331

#### Slide 8 -Slide

FOTOVRAAG:      write as a percentage:
A difficult one!
COPY and WORK it Work out in your Notebook.
Take a pic of YOUR WORK and send it in in the next slide.
Who will be succesful?!

= ............ %
25082
timer
1:00

#### Slide 10 -Open question

written as a percentage:
This is the same as :
82 x 4     divided by        4 x 250 = 1000,  so it is
, which is the same as                               , so it is:
32.8 %  !

25082
1000328
10032.8

#### Slide 11 -Slide

The final exercise is about the relations between
decimal numbers, percentages and fractions.

#### Slide 12 -Slide

Write 92.5 % as a decimal number:
timer
0:25
A
9.25
B
92.5
C
0.925
D
0.93

#### Slide 13 -Quiz

Explanation:
92.5 %  is the same as 92.5 of 100, or:
0.925
The method here is:
from a percentage to a decimal number means replacing the point
two places to the left! Just like: 25 % is 0.25

#### Slide 14 -Slide

Homework time
Make §7.6 now. You may skip exercise 44.