LO: To solve problems involving the use of percentages.
What a percentage represents.
That percentage can be used to represent a portion of a whole number.
I can calculate percentage of a quantity.
I can express a quantity as a percentage of another.
What is a Percentage?
A percentage is a part of a whole, but more specifically it is a whole out of 100.
How do I Find a Percentage?
One easy way to find a percentage is to use a calculator and divide the numerator by the denominator.
Once you do that it should give you a decimal number, which if you then multiply it by 100 it should give you a percentage. You have to multiply it by 100 because percentage values are always out of 100.
Finding the Original Amount from an Percentage Increase
On some occasions you get a question like this one.
$138 includes a 15% tax. What was the price before the tax was added on?