# CH10 Test preparation

What do you need to know/should you be able to do from Chapter 10?
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Slide 1: Woordweb
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In deze les zitten 12 slides, met interactieve quiz en tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

What do you need to know/should you be able to do from Chapter 10?

#### Slide 1 -Woordweb

Example test question
1. Solve the equations
a.     8t + 10 = 34
b.     28 - 0.3w = 13
c.     2.4f + 7 = 37

#### Slide 2 -Tekstslide

Solutions
1. Solve the equations
a.     8t + 10 = 34
8t = 24
t = 3
b.     28 - 0.3w = 13
0.3w = 15
w = 50
c.     2.4f + 7 = 37
2.4f = 30
f = 12.5
What should you pay attention to?
- Did you write down the correct steps?
- How can you use your calculator?

#### Slide 3 -Tekstslide

Example test question
2. Solve the equations. Give an exact answer and an approximation accurate to 3 decimal places.
a.     3k + 5 = 16

b.
2t+731=15

#### Slide 4 -Tekstslide

Solutions

What should you pay attention to?
- Did you write down the correct steps?
- How can you use your calculator?
- What is an exact solution?
- How do you round off?
3k+5=16
3k=11
k=311=3323.667
2t+731=15
2t=732
t=2732=3653.833

#### Slide 5 -Tekstslide

Example test question
3. Calculate and round off to 2 decimal places.

a.

b.           of 50 000

1915
273

#### Slide 6 -Tekstslide

SOLUTIONS

of 50 000
What should you pay attention to?
- How can you type in a fraction on your calculator?
- How do you round off?

19150,79
273
121428,57

#### Slide 7 -Tekstslide

Example test question

4. The graph on the right tells you
the height (h) in cm of a candle
after a given time (t) in minutes.

After how many minutes does the
candle have a height of 16 cm?

#### Slide 8 -Tekstslide

Solutions
t   0          20
h  100     40               60 : 20 = 3

h = 100 - 3t

16 = 100 - 3t
3t = 84
t = 28

After 28 minutes, the candle has a height
of 16 cm
What should you be capable of doing?
- Making a formula for a graph
- Making an equation for a problem
- Solving an equation

#### Slide 9 -Tekstslide

Example test question
5. You can calculate the grade for a Maths test using the formula
g is the grade and p is the number of points earned, you can only score whole points.

a. Maaike earned a 10 for the test, how many points did she get?
b. Calculate p if g = 7.3
c. Tom received the grade 6.6, how many points did he get?
g=0.225p+1

#### Slide 10 -Tekstslide

Solutions
a. 10 = 0.225p + 1
0.225p = 9
p = 40                  Maaike got 40 points.

b. 7.3 = 0.225p + 1
0.225p = 6.3
p = 28

c. 6.6 = 0.225p + 1
0.225p = 5,6
p = 24.888.....
g = 0.225x24+1= 6,4            Tom got 25 points.
g = 0.225x25+1=6,625
What should you be capable of doing?
- Making an equation for a problem
- Solving an equation
- Rounding off sensibly

More practice