What two numbers have a GCF of 644?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 644.

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 644. Below is the beginning list of multiples of 644 (1 through 7) in numerical order.

1. 644
2. 1288
3. 1932
4. 2576
5. 3220
6. 3864
7. 4508
etc...

Two numbers that have a GCF of 644 can be 644 and any other number on the list above. Thus, two numbers that have a GCF of 644 are:

644 & 1288
644 & 1932
644 & 2576
etc...

That is not all! Any combination of any multiple of 644 and "odd" multiples of 644 will also have GCF of 644. 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 644.

1288 & 1932
1288 & 3220
2576 & 3220
2576 & 4508
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 644. 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 644, what are the numbers?" or "What are two numbers whose GCF is 644?"

What two numbers have a GCF of 645?
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