3Thavo §8.6(A) or §10.6(B)

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

Math A:  §8.6 Mixed exercises

Math B: §10.6 Mixed exercises

Math B pupils:

+ Reason to be sad: 

       This time there is only Instruction for Math A pupils.

+ Reason to be glad: 

        You have got more time to finish:   §10.6 Mixed exercises!

         Just a few TIPS for you in the next slide.

Math B pupils:

Choose 2 exercises from p.104 and

do all exercises from p.105.

+ §10.6  Mixed exercises is awaiting on you!

+ Make beautiful drawings and constructions, using your compasses too.

+ Do consult the earlier paragraphs and the Solutionsbook too, because

   1st:               the 'B' exercises (42, 43 and 44) are pretty hard, for a part

   2nd:            you do not have to know by heart what a 'median' or an 'angle bisector' means. 

+ This § will give you an even better idea of what you can expect doing Math B in higher forms!

Math A pupils:

Before you do §8.6 yourself ....

+ Let's march through some of the exercises together.

+ You will be asked to work out and answer some of them.

+ After this you will have an easier time, doing it by yourself!

In the bar chart you see that:

+ in 2000 there were 15.7 millions of people

+ 7.4 per 100 000 people died in traffic

QUESTION 1 : How many people actually died in 2000?

- Work this out with your Casio and

- Key in in next slide! (no writing needed, now)

How many people died in traffic in 2000?

Answer 1 (1st method):

(1 570 000 : 100 000) x 7.4 = 1162 victims

Explanation:  

+we first calculate how many times 100 000 fits in 1 570 000

+ the outcome of this we multiply by 7.4, because 

+ for every 100 000 people, 7.4 die in traffic

Answer 2(2nd method):

The Solutionsbook is fond of ratio tables. Also very good,

of course, but a little more work. (Now you did not have enough time for it, I guess.)

Question 2:

+ Take your calculator and try to 

+work out the question below, rounding your final answer to one decimal and

+ filling in your answer in the next slide!

+ of course you can find this task in your book, too, p.30!

Doing exercise 38 ....

So use your paper textbook 3B p.30!

The mean number of km is ........
A. 16.6 B. 17.6
C. 15.6 D. 14.6

1. 16.6
2. 17.6
3. 15.6
4. 14.6

Answer 2: (next slides reflect on this!)

Was this a hard nut to crack?

a few tips for Question 2 / exercise 38:

+ on p.16 the Method is given, how to:

   calculate the mean of given data

+ maybe you forgot to use the 'midpoints' of the groups?

+ maybe you rounded to a whole number? So: the answer

    'A. 16'  was half good! (But unfortunately no half points are given here...)

After all ...

+ having scored more or less points is not of the greatest                    importance

+ what counts more is that by participating you have:

          1. refreshed your memory and/or

          2. learned something new

Homework time.

+ After all this preliminary work,

+ doing §8.6 may not be that hard any more!

+ do all exercises; the parts we did together will go easier now!

+ Try hard and, if a problem comes up:

    consult the Solutionsbook to see the right direction.