What two numbers have a GCF of 120?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 120.

There is actually an infinite number of answers to this question. First, note that both the numbers we are looking for must be multiples of 120. Below is the beginning list of multiples of 120 (1 through 7) in numerical order.

1. 120
2. 240
3. 360
4. 480
5. 600
6. 720
7. 840
etc...

Two numbers that have a GCF of 120 can be 120 and any other number on the list above. Thus, two numbers that have a GCF of 120 are:

120 & 240
120 & 360
120 & 480
etc...

That is not all! Any combination of any multiple of 120 and "odd" multiples of 120 will also have GCF of 120. We numbered the multiples above so it would be easy to identify the "odd" multiples (number 1, 3, 5, 7, etc). Thus, here are some more examples of two numbers that also have a GCF of 120.

240 & 360
240 & 600
480 & 600
480 & 840
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 120. The lists we created can go on forever.

Two numbers have a GCF of Calculator
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Teacher Tip: If you are a teacher, you could ask these questions of your students: "I am thinking of two numbers and the GCF is 120, what are the numbers?" or "What are two numbers whose GCF is 120?"

What two numbers have a GCF of 121?
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