1TH/vwo §11.2 Multiplication

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 1

§11.2 Multiplication - a recap:

-  when ADDING we talk about TERMS:  2a +  4b = d    

    here 2a and 4b are the TERMS that you add together

-  when MULTIPLYING we talk about FACTORS:  

    5 x 6 = 30          here 5 and 6 are FACTORS., so numbers that are multiplied.

   Or            6f x 7f = g

    here 6f and 7f are the FACTORS that you multiply;

    How?  This you'll learn in this paragraph!

   

Task : What MISTAKE has been made here?!

Think about it.

Solution Task :   The number 6 in the answer is wrong.

                                    3 x 2 x 2 = 12   and  not  6!

Open your Notebook and get a pen.

Make task 10 on the next slide.

2a + 5 = p
Here 2a and 5 are ...

1. factors
2. terms
3. numbers
4. variables

2a + 5 = p

SOLUTION:

2a and 5 are the TERMS,

because they are ADDED together.

4 - 7c = h
This is a(n) ....

1. formula
2. calculation
3. equation

4 - 7c = h

SOLUTION:

This is a FORMULA:

It contains 2 Variables. 

When you fill in a number for c, you can calculate h.

7 - 5c -3 + 2c =.....

1. -4 - 2c
2. 4 + 7c
3. 4 - 3c
4. 10 -3c

Make task a in your Notebook.

Solution: length =   , width =    ,   Area = l x w, so:

Area of one tile is  =       x       =

k​2​​

k

k

k

k

Make 10b in your Notebook:

SOLUTION:

Make 10c in your Notebook now.

SOLUTION:

6f x 5f = ...

1. 30 f
2. 11 f
3. 11 f-squared
4. 30 f-squared

SOLUTION:

                                                         

                                   6f x 5f = 

30f​2​​

Calculate the AREA of a RECTANGLE with these measurements:
-6 p squared and -4.1 p squared

1. -24.6 p squared
2. 24.6 p squared
3. -10.1 p
4. -10.1 p squared

SOLUTION

x                     = 

−6p​2​​

−4.1p​2​​

24.6p​2​​

Homework time.

Do §11.2 Multiplication

VWO:  + you may skip 8 and 10    Do C2 and C3 too!

H/V:  + you may skip 8 and 10          + do S12 too!

Task: Try to find both formulas!

Think hard about the answers!

Solution: A:   l x w = Area, so 5p x 3p = 15 

B:  A triangle is only half of a rectangle!  So we get:

     3   x 4    x        =  6     

               

​2​​1​​

p​2​​

p​2​​

p

p

Next slide shows an exercise that we do together now.

1st   Open your Notebook and get a pen.

2nd Answer question a in your

         Notebook.

What is the Volume in 13a?

1. 3200
2. 320
3. 160
4. 32

As you will know(?):

Volume = length x width x height

Therefore the Solution is:

Answer this task in your Notebook.

With 'this vase' the largest is meant.

The height is 20 cm. The value of s we don't know. It's just s!

Solution:

Homework time.

Do §11.2 Multiplication

+ you may skip   8 and 10