More Lessons for Arithmetic

Math Worksheets

To find the percentage of a number:

** Step 1** : Change the percent to a fraction

**Step 2 **: Multiply the fraction by the number

*Example: *

Evaluate 25% of 200

*Solution: *

25% of 200 =

= 50

* Example: *

There are 25 marbles in a bag. If 20% of the marbles are red, how many of them are red?

* Solution* :

Number of red marbles = 20% of 25

=

= 5

There are 5 red marbles in the bag.

Sometimes we may be given the percentage of a number and we are asked to find the number that represents the whole quantity. To find the whole quantity, we divide the given number by the given percentage.

* Example:*

If 25% of a number is 12, what is the number?

* Solution: *

Total quantity

*Example:*

Amy saves RM 240, which is 12% of her salary. What is her salary?

* Solution*

Salary

Her salary is RM 2,000

You can also find the percentage of a number by first changing the percent to a decimal

** Step 1** : Change the percent to a decimal

**Step 2 **: Multiply the decimal by the number

The following video will give examples of using decimals to find the percentage of a number

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.