What two numbers have a GCF of 520?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 520.

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 520. Below is the beginning list of multiples of 520 (1 through 7) in numerical order.

1. 520
2. 1040
3. 1560
4. 2080
5. 2600
6. 3120
7. 3640
etc...

Two numbers that have a GCF of 520 can be 520 and any other number on the list above. Thus, two numbers that have a GCF of 520 are:

520 & 1040
520 & 1560
520 & 2080
etc...

That is not all! Any combination of any multiple of 520 and "odd" multiples of 520 will also have GCF of 520. 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 520.

1040 & 1560
1040 & 2600
2080 & 2600
2080 & 3640
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 520. 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 520, what are the numbers?" or "What are two numbers whose GCF is 520?"

What two numbers have a GCF of 521?
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