3. What is as i) decimal and ii) fraction?
i)
ii)
as a fraction
in its simplest form
4. What is as a percentage?
Express as a fraction with 100 as the
denominator
5. What is as a percentage?
Write as a fraction with 100 as the
denominator
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Presentation 5 Percentage Increases and Decreases
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11. Find of J$76
First convert the percentage into either a
fraction or decimal
Decimal method
12. Find of J$76
First convert the percentage into either a
fraction or decimal
Fraction method
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15. 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:
16. 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:
17. 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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20. 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)
21. 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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