CH10 Test preparation

• Wiskunde
• Middelbare school
• havo
• Leerjaar 1

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

Example test question

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

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?

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+7​3​​1​​=15

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=​3​​11​​=3​3​​2​​≈3.667

2t+7​3​​1​​=15

2t=7​3​​2​​

t=​2​​7​3​​2​​​​=3​6​​5​​≈3.833

Example test question

3. Calculate and round off to 2 decimal places.

a.


b.           of 50 000

​19​​15​​

2​7​​3​​

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?

​19​​15​​≈0,79

2​7​​3​​

≈121428,57

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?

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

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

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

- Make your own summary and Practice Test in your workbook
- Remake old homework exercises
- Test Yourself, Extra-Basic, Extra-Mixed, Extra-Challenge
- Test Yourself online