# 1718 WH3X CH1 lesson 1

Welcome to Mathematics

Ms B.J.E. Mulders-Kunst (KUNB)
bje.mulders@tabor.nl
1 / 15
Slide 1: Tekstslide
WiskundeMiddelbare schoolhavoLeerjaar 3

In deze les zitten 15 slides, met tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

Welcome to Mathematics

Ms B.J.E. Mulders-Kunst (KUNB)
bje.mulders@tabor.nl

#### Slide 1 -Tekstslide

At the start of each lesson
- Book, pencilcase, calculator, notebook on your desk
- Find the homework for that lesson in your notebook
- No earbuds/headphones, phones or other devices (if using an iPad with Studiekit: close all other apps)

#### Slide 2 -Tekstslide

See the "guidelines Mathematics" on Magister

Schedule

#### Slide 4 -Tekstslide

Maths in year 3
- Language and notation
- Choice at the end of the year: Maths A, Maths B or no Maths

#### Slide 5 -Tekstslide

Chapter 1: Exponential Growth
In this lesson you will learn:
- How to work in your notebook
- What a (growth)factor is
- How to convert a percental increase/decrease to a factor
- What the standard form of an exponential formula is
- How to find the initial amount and growth factor in a simple table or graph

#### Slide 6 -Tekstslide

Factor
A factor is the number by which you multiply an original amount to get a new amount.

#### Slide 7 -Tekstslide

Factor
a) Prices are increased by 15%, what factor do you use to calculate the new price from the old price?
b) Prices are decreased by 20%, what factor do you use to calculate the new price from the old price?

#### Slide 8 -Tekstslide

Factor
a) Prices are increased by 15%, what factor do you use to calculate the new price from the old price?

Factor = 1.15

#### Slide 9 -Tekstslide

Factor
b) Prices are decreased by 20%, what factor do you use to calculate the new price from the old price?

Factor = 0.8

#### Slide 10 -Tekstslide

Exponential formula
The standard form of an exponential formula is:
y and t are the variables
b is the initial amount
g is the growth factor
y=bgt

#### Slide 11 -Tekstslide

Exponential formula
The standard form of an exponential formula is:
y and t are the variables
b is the initial amount
g is the growth factor
The initial amount is the value of y when t = 0
The growth factor is the factor you multiply y with when t increases by 1
y=bgt

#### Slide 12 -Tekstslide

Exponential formula
Give the formula for the table below
y=bgt

#### Slide 13 -Tekstslide

Exponential formula
Give the formula for the table below

Initial amount (b) = 250
Growth factor = 0.8

y=bgt
y=2500.8t
250200=0.8
200160=0.8
160128=0.8

#### Slide 14 -Tekstslide

Homework
- Read the guidlines Mathematics on Magister
- Make exercises R1, R2, R5, R6, R7 on pages 8 and 9
- Correct your homework with the solutionsbook (page 6)