### What are the factors of 21

The factors of the number 21 are any numbers that divide into it exactly. This includes 1 and 21.The total factors for 21 are:

**1, 3, 7, 21**

### What are factors of 21 used for?

Holy cow is it difficult to explain how factors are used in real life. There aren't many direct relationships or good examples of how factors can be applied. The best explanation is to say that factors are a building block to help students understand more complex mathematical subjects that do have a more direct correlation to real life. For example, factors are key to understanding algebra and then statistics and calculus. Don't be discouraged, there are some really simple real life examples of factors. The next time you go to pay for something and calculate change, or combinations of coins you need to pay for a total amount, you are using factors. You're figuring out how many whole numbers can be used to achieve the total. In the case of a dollar bill, you would be using factors of 100 in the forms of 1, 5, 10, 25, 50 and 100. There are other factors, but they aren't available in denominations that we can get at a bank.

Here are some helpful links that may be worth checking out:Factor Video

Factor Games