# 1TH/vwo §12.3 Multiplication and addition

Here are the LIKE TERMS again, never leaving us alone.
However, recognising them makes your Maths life easier!

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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

In deze les zitten 26 slides, met interactieve quizzen en tekstslides. Lesduur is: 45 min

## Onderdelen in deze les

Here are the LIKE TERMS again, never leaving us alone.
However, recognising them makes your Maths life easier!

#### Slide 1 -Tekstslide

Task:  Try to find the final answer for the easiest one.
Remember your answer, because you won't see the task in the next slide!

#### Slide 2 -Tekstslide

The answer to the easiest one is:
A
25
B
50
C
269
D
250

#### Slide 3 -Quizvraag

Solution:
Did you notice that this task was all
The terms 8 x         and
2 x              are the like terms here.
They are added up, as you can see.
52
52

Solution:

#### Slide 7 -Tekstslide

Task: Which tasks(s) has LIKE TERMS: A, B or C?

#### Slide 8 -Tekstslide

Like terms are in:
A
A
B
B
C
C
D
A and C

#### Slide 9 -Quizvraag

in the next slide.

#### Slide 11 -Woordweb

Task:   Shorten formula A.
SOLUTION:

s=7t2

#### Slide 13 -Tekstslide

A.   Intro to the coming THEORY (1)
Do you remember this, about shortening?

This was taken from Ch 10. The same thing applies with squares!
Watch the next slide and be amazed.
1x=x
1x=x
1f=f
1f=f

#### Slide 14 -Tekstslide

B. Intro to the next slide (2)
Basic rules:      1f = f    or     f = 1f          and        -1h = -h         or       -h = -1h
4f + 3f = 7f
4f + f = 4f + 1f = 5f
7d - d = 7d - 1d = 6d
Next we will look at similar calculations, only now with quadratic tasks!

#### Slide 15 -Tekstslide

Which one is true?
A
-1v = -v
B
v + v = v
C
-v -v = 2v
D
-v + v = 0

#### Slide 16 -Quizvraag

Solution:
A.     -1v = -v  is correct, because '1' can be left out
B.     v + v = v  is wrong, because v + v = 1v + 1v = 2v
C.     -v - v = 2v  is wrong, because -v -v = -1v -1v = -2v
D.     -v + v = -1v + 1v = 0  is correct

#### Slide 22 -Tekstslide

How to solve this exercise?
-see next slide too!-

#### Slide 23 -Tekstslide

How to solve this exercise? Like this:
FIRST WORK THEM OUT; ONLY THEN YOU CAN MAKE PAIRS!

#### Slide 24 -Tekstslide

FIRST WORK THEM OUT; ONLY THEN YOU CAN MAKE PAIRS!

Okay, let's do a bit together now:
1.                          x                =
So now it is obvious that  formula 1 and formula 7  are equal!
When doiung 21 for homework, work them all out and only then combine them!
p=k
k
k2

#### Slide 25 -Tekstslide

Homework time.
Do §12.3 now.
+ you may skip: 15, 16 and 17
+ H/V:   S16, S18, 19, 20, 21, 22,
+ VWO:  18. t/m. 23. and C4+C5