You add the two numbers and divide them by two. For simplicity, you may convert the two

**percentage**values into decimals before dividing them by two to calculate the**average**. Multiply the resulting value by 100 if you need the answer as a**percentage**. First, convert the two**percentages**into decimals.Correspondingly, what is the formula for average?

Both the

**average**and the**mean**use the same**formula**: avg = total sum of all the numbers / number of items in the set. In other words, to find the**average**, add up all of the numbers in the set, and then divide by however many items you have.How do you work out the average of a number?

Most of the time when the term '

**average**' is used in a mathematical sense it refers to the**mean average**. Add the numbers together and divide by the number of numbers. (The sum of values divided by the number of values). Arrange the numbers in order, find the middle number.How do you work out averages on a calculator?

**Steps**

- Determine the set of values you want to average. These numbers can be big or small, and there can be as many of them as you want.
- Add your values together to find the sum.
- Count the number of values in your group.
- Divide the sum of the set by the number of values.