When asked to

**find**a certain**percent of a number**, you must first change the**percent**to a decimal or fraction, and then MULTIPLY that by the**number**.**Find**40% of 45.Just so, how do I calculate a percentage?

To

**calculate percentage**decrease: First: work out the difference (decrease) between the two numbers you are comparing. Then: divide the decrease by the original number and multiply the answer by 100. If your answer is a negative number then this is a**percentage**increase.How do you get a percentage of an amount?

You just have to convert the

**percentage**into a decimal which you the multiply by the number that you want to find the**percentage**of. If you want to find for example, 87% of 642. You enter the following on your calculator 0.87 x 642. This will geive you your answer.Why do we use percentages?

**Percentages**are an important part of our everyday lives.

**Percentage**is a very handy way of writing fractions.

**Percentages**can be compared more easily than fractions. Financial institutions quote interest charged to the client on loans, or interest paid for money invested, as a

**percentage**.