# DB1N 16-6

Welcome
1 / 34
Slide 1: Slide
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 34 slides, with interactive quizzes and text slides.

Lesson duration is: 45 min

## Items in this lesson

Welcome

#### Slide 1 -Slide

Planning
• Prior knowledge
• New theory

Simplify
10a2b
A
20ab
B
12ab
C
-20ab
D
8a

Simplify
7xy+8xy
A
xy
B
14xy
C
14x
D
15xy

Simplify
3ab+7ac
A
4ab
B
na
C
4bc
D
4ac

Simplify
3a6a
A
18a2
B
18a
C
na
D
9a

Simplify
4x7y
A
-28xy
B
28xy
C
na
D
-11xy

New theory

#### Slide 10 -Slide

You saw how to simplify products with letters and how to simplify like terms.

Now we are going to combine these two.

#### Slide 11 -Slide

How would you calculate
38+75

#### Slide 12 -Slide

How would you calculate
38+75
38+75=

#### Slide 13 -Slide

How would you calculate
38+75
first multiplication
38+75=
38+75

#### Slide 14 -Slide

How would you calculate
38+75
24+35=
first multiplication
38+75=
38+75

#### Slide 15 -Slide

How would you calculate
38+75
24+35=
first multiplication
38+75=
then the sum
38+75

#### Slide 16 -Slide

How would you calculate
38+75
24+35=
first multiplication
59
38+75=
then the sum
38+75

#### Slide 17 -Slide

But what when there are letters in the calculation?
53a+64a

#### Slide 18 -Slide

But what when there are letters in the calculation?
53a+64a
What do you think is the first step?

#### Slide 19 -Slide

But what when there are letters in the calculation?
53a+64a=
Step 1: multiplication
Write down!

#### Slide 20 -Slide

But what when there are letters in the calculation?
53a+64a=
Step 1: multiplication
Write down!
15a+24a=

#### Slide 21 -Slide

But what when there are letters in the calculation?
53a+64a=
Step 1: multiplication
Write down!
15a+24a=
What is the next step?

#### Slide 22 -Slide

But what when there are letters in the calculation?
53a+64a=
Step 1: multiplication
Step 2: combine like terms
Write down!
15a+24a=

#### Slide 23 -Slide

But what when there are letters in the calculation?
53a+64a=
Step 1: multiplication
Step 2: combine like terms
Write down!
15a+24a=
39a

#### Slide 24 -Slide

Simplify
29b3b3
Write down the intermediate steps!

#### Slide 25 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1:
Write down

#### Slide 26 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1: multiplication
Write down

#### Slide 27 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1: multiplication
36xy+3yz=
Write down

#### Slide 28 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1: multiplication
Step 2:
36xy+3yz=
Write down

#### Slide 29 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1: multiplication
Step 2: combine like terms
36xy+3yz=
Write down

#### Slide 30 -Slide

How to simplify
6x5y+3yz
6x5y+3yz=
Step 1: multiplication
Step 2: combine like terms
36xy+3yz
Write down

#### Slide 31 -Slide

Simplify
6a7b4b5c
Write down the intermediate steps!

Questions?

#### Slide 33 -Slide

Homework:
For Monday 21 June
Make: ex. 5, 7, 8, 10 on page 93