Factors of 21 in Pairs
So you need to find the factor pairs for 21 do you? Fear not! In this quick guide we'll describe what the factor pairs of 21 are, how you find them and list them out for you to prove the calculation works. Let's dive in!
What Are Factor Pairs?
A factor pair is a combination of two factors which can be multiplied together to equal 21. In proper math terms, the number 21 is called the product and the two numbers that can be multiplied together to equal it are called the factors.
In order to work out the factor pairs of 21 we need to first get all of the factors of 21. Once you have the list of all those factors we can pair them together to list out all of the factor pairs.
The complete list of factors for 21 are 1, 3, 7, and 21.
List of Factor Pairs for 21
Okay, so we know all of the factors for 21 now and to work out the factor pairs we can go through that list and find all of the different combinations that can be used to multiply together to result in 21.
If there are a lot of factors then it might take you a little while to calculate all of the factor pairs, but luckily we have the power of computers and can calculate the factor pairs of 21 for you automatically:
- 1 x 21 = 21
- 3 x 7 = 21
- 7 x 3 = 21
- 21 x 1 = 21
So there you have it. A complete guide to the factor pairs of 21. Hopefully this will help you in your math class to learn (or teach) factor pairs in a way that is easy to understand.
Feel free to try the calculator below to check another number or, if you're feeling fancy, grab a pencil and paper and try and do it by hand. Just make sure to pick small numbers! ;)
Factor Pair Calculator
Want to find the factor pairs for another number? Enter your number below and click calculate.