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.