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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