# 1718 WB1Z CH4+8 Lesson 3

Which homework exercises would you like for me to discuss on the board?
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Slide 1: Mind map
WiskundeMiddelbare schoolvwoLeerjaar 1

This lesson contains 18 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

Which homework exercises would you like for me to discuss on the board?

#### Slide 1 -Mind map

Recap: Order of Operations
Calculate and show steps
25 - 18 : 3 + 2 x (7-3) =

#### Slide 2 -Open question

87+32243=
A
132
B
1125
C
356
D
none of the above

B.
1125

#### Slide 4 -Slide

Recap: Multiplying fractions
(the . means x)

15332=
A
141
B
1156
C
152
D
none of the above

#### Slide 5 -Quiz

D. none of the above

#### Slide 6 -Slide

Language
vijf keer vier is twintig                    five times four equals twenty
vermenigvuldigen (x)                     multiplying
tien gedeeld door vijf is twee     ten divided by five equals two
delen (:)                                                 division
vijf plus vier is negen                      five plus four equals nine
vijf min drie is twee                         five minus three equals two
aftrekken                                             subtraction

#### Slide 7 -Slide

Language
vijf in het kwadraat is vijfentwintig      five squared equals twentyfive

breuk                                                                 fraction
teller                                                                   numerator
noemer                                                             denominator
drie vijfde                                                        three fifth
53

#### Slide 8 -Slide

Squaring fractions
You can also square fractions. When we write this down, you put brackets around the fraction you are squaring.

#### Slide 9 -Slide

Squaring fractions
You can also square fractions. When we write this down, you put brackets around the fraction you are squaring.

#### Slide 10 -Slide

Order of operations
When calculating with fractions, you have to follow the order of operations.
1. Calculate what is within brackets
2. Calculate squares
3. Multiply and divide from left to right
4. Add and subtract from left to right

#### Slide 11 -Slide

Decimal numbers
When multiplying with 10, 100, 1000, but also 0.1, 0.01, 0.001, etc, you can notice a pattern.
12 x 1 = 12                                                12 x 1 = 12
12 x 10 = 120                                          12 x 0.1 = 1.2
12 x 100 = 1200                                     12 x 0.01 = 0.12
12 x 1000 = 12 000                               12 x 0.001 = 0.012
12 x 10 000 =  120 000                       12 x 0.0001 = 0.0012
You keep adding one zero.           You keep moving the decimal point to the left

48 x 0.0001 =

#### Slide 13 -Open question

Fractions -> Decimal numbers
You can write fractions as decimal numbers.

#### Slide 14 -Slide

Fractions -> Decimal numbers
If you can write a fraction with a denominator 10, 100, 1000, etc, you can turn the fraction into a decimal number, by moving the decimal point in the numerator.

#### Slide 15 -Slide

Write as a decimal number
258

#### Slide 16 -Open question

Fractions -> Decimal numbers
Some fractions cannot be written as decimal numbers.
Example:

Not the exact same result, therefore it is not exactly 0.17

#### Slide 17 -Slide

Homework Friday
Make and correct from §4.3 and §4.4:
22, 24, 25, 28, 30, 32, 33

correcting your homework is part of the homework!