math unit2 percentages

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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Unit 2Percentages

Conversion: Revision

Fractions Decimals Percentages


Conversion: Revision


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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


Percentages as Quantities


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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


Quantities as Percentages


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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)


Percentage Increases and Decreases


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math unit2 percentages

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