What two numbers have a GCF of 639?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 639.

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 639. Below is the beginning list of multiples of 639 (1 through 7) in numerical order.

1. 639
2. 1278
3. 1917
4. 2556
5. 3195
6. 3834
7. 4473
etc...

Two numbers that have a GCF of 639 can be 639 and any other number on the list above. Thus, two numbers that have a GCF of 639 are:

639 & 1278
639 & 1917
639 & 2556
etc...

That is not all! Any combination of any multiple of 639 and "odd" multiples of 639 will also have GCF of 639. 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 639.

1278 & 1917
1278 & 3195
2556 & 3195
2556 & 4473
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 639. 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 639, what are the numbers?" or "What are two numbers whose GCF is 639?"

What two numbers have a GCF of 640?
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