Unit 2
Percentages
Presentation 1
Conversion
Presentation 2
Conversion: Revision
Presentation 3
Percentages of Quantities
Presentation 4
Quantities as Percentages
Presentation 5
Percentage Increases and Decreases
Unit 2
Percentages
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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Conversion: Revision
Presentation 3
Percentages of Quantities
Presentation 4
Quantities as Percentages
Presentation 5
Percentage Increases and Decreases
Unit 2
Percentages
Conversion: Revision
Fractions
Decimals
Percentages
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Percentages of Quantities
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Quantities as Percentages
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Percentage Increases and Decreases
Unit 2
Percentages
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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Conversion
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Conversion: Revision
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Quantities as Percentages
Presentation 5
Percentage Increases and Decreases
Unit 2
Percentages
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 2
Percentages
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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Presentation 1
Conversion
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Conversion: Revision
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Percentages of Quantities
Presentation 4
Quantities as Percentages