# 1TH/vwo §11.3 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: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 1

This lesson contains 26 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

## Items in this lesson

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

#### Slide 2 -Slide

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

#### Slide 3 -Quiz

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 8 -Slide

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

#### Slide 9 -Quiz

in the next slide.

SOLUTION:

s=7t2

#### Slide 13 -Slide

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 -Slide

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 -Slide

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

#### Slide 16 -Quiz

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 -Slide

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

#### Slide 23 -Slide

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

#### Slide 24 -Slide

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 -Slide

Homework time.
Do §11.3 now.
+ you may skip: 15, 16 and 17
+ H/V:   S16, S18, 19, 20, 21, 22,
+ VWO:  18. t/m. 23. and C4+C5