Percentages
What are percentages?
Introduction to percentages. A fraction expressed as the number of parts per hundred and recorded using the notation %.
How to calculate percentages
Find a percentage of a given amount using mental methods and using a calculator.
How to find a percentage of an amount using bar models
Percentages of amounts can be represented diagrammatically using bar models.
How to increase an amount by a percentage
How to calculate a percentage increase using the decimal method.
How to decrease an amount by a percentage
How to calculate a percentage decrease using the decimal method.
How to find the original value before percentage off
How to calculate a reverse percentage by finding the original amount after a percentage increase or decrease.
How to work out interest
How to calculate the interest on an amount and the new total amount (original + interest) given the interest rate.
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