Transcript
Unit 2Percentages
Presentation 1 Conversion
Presentation 2 Conversion: Revision
Presentation 3 Percentages of Quantities
Presentation 4 Quantities as Percentages
Presentation 5 Percentage Increases and Decreases
Unit 2Percentages
Conversion
What is as i) decimal and ii) fraction?
i)
ii)
as a fraction
in its simplest form
What is as a percentage?
Express as a fraction with 100 as the denominator
What is as a percentage?
Write as a fraction with 100 as the denominator
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Conversion
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Presentation 2 Conversion: Revision
Presentation 3 Percentages of Quantities
Presentation 4 Quantities as Percentages
Presentation 5 Percentage Increases and Decreases
Unit 2Percentages
Conversion: Revision
Fractions Decimals Percentages
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Conversion: Revision
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Presentation 1 Conversion
Presentation 3 Percentages of Quantities
Presentation 4 Quantities as Percentages
Presentation 5 Percentage Increases and Decreases
Unit 2Percentages
Percentages of Quantities
Find of J$76
First convert the percentage into either a fraction or decimal
Decimal method
Find of J$76
First convert the percentage into either a fraction or decimal
Fraction method
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Percentages as Quantities
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Presentation 1 Conversion
Presentation 2 Conversion: Revision
Presentation 4 Quantities as Percentages
Presentation 5 Percentage Increases and Decreases
Unit 2Percentages
Quantities as Percentages
In a class of 25 students, there are 10 girls. What percentage of the class are girls?
The fraction of girls is:
As a percentage, this is:
A book contained 80 black and white pictures and 120 colour pictures. What percentage of the pictures were in colour?
The fraction of colour pictures:
As a percentage this is:
A bank pays interest of % per annum.
How much interest do you get in one year if you invest J$50?
Interest
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Quantities as Percentages
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Presentation 1 Conversion
Presentation 2 Conversion: Revision
Presentation 3 Percentages of Quantities
Presentation 5 Percentage Increases and Decreases
Unit 2Percentages
Percentage Increases and Decreases
Percentage increase
Example: The population of a village increased from 234 to 275 in one year. What was the percentage increase?
Actual increase
Percentage increase
(to 2 decimal places)
Percentage decrease
Example: A cup of sand is dried in a hot oven. Its mass reduces from 450 grams to 320 grams. What is the percentage decrease of its mass?
Actual reduction
Percentage reduction
(to 1 decimal places)
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Percentage Increases and Decreases
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Presentation 1 Conversion
Presentation 2 Conversion: Revision
Presentation 3 Percentages of Quantities
Presentation 4 Quantities as Percentages
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