Presentations text content in Proportions and Percentages
Slide1
Proportions and Percentages
By Louise Penny
and
Hilary Newton
Slide2Scenario
It is your 21
st
birthday and you have decided to have a costume party. You will provide finger foods and it is BYO drinks ! Your guests will leave with a
lolly
bag
The invitations have been sent out and you have received your RSVP’s
Let’s get this party started !!
Slide3How Many People are Attending?
You sent out 50 invitations and 30 people have RSVP’d to confirm their attendance. What percentage are attending? What percentage have declined?
X
Slide4Lollies
You have 3 types of lollies. You want to distribute a total of 24 lollies into the lolly bags, to the ratio of 5:4:3.
Slide5How many lollies did you have to the ratio of 5?How many lollies did you have to the ratio of 4?How many lollies did you have to the ratio of 3?
Slide6Costumes
Find the final price of these costumes in Euros !
€ 50
postage = 10% of garment price
€ 75
postage = free
Special: 20% off !
Slide7Convert your Final Price into $ AUD
1 € = $ 1.50
Slide8Recipes
You have chosen the recipes for your 21
st
. However they serve less or more than 30 people.
What proportion is your recipe serving of your guests?
E.g. you are serving 10 people. Your recipe serves 5 people.
The proportion is 5 out of 10, which can be expressed as 50%, 0.5 or ½
.
E.g. you are serving 10 people. Your recipe serves 15 people. The proportion is 15 out of 10, which can be expressed as 150%, 1.5 or 1½.
Slide9Recipes
Change quantities of the recipe to serve 30
Recipe A serves 75 people. Change this recipe to serve 30 people
.
Recipe B serves 20 people. Change this
recipe
to serve 30 people.
Slide10Strategies
Haylock: four-cells diagram
Trial and error
Concrete/Manipulation
Estimation
Models/Diagrams
Patterns/Like numbers
Proportions and Percentages
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