What two numbers have a GCF of 645?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 645.

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 645. Below is the beginning list of multiples of 645 (1 through 7) in numerical order.

1. 645
2. 1290
3. 1935
4. 2580
5. 3225
6. 3870
7. 4515
etc...

Two numbers that have a GCF of 645 can be 645 and any other number on the list above. Thus, two numbers that have a GCF of 645 are:

645 & 1290
645 & 1935
645 & 2580
etc...

That is not all! Any combination of any multiple of 645 and "odd" multiples of 645 will also have GCF of 645. 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 645.

1290 & 1935
1290 & 3225
2580 & 3225
2580 & 4515
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 645. 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 645, what are the numbers?" or "What are two numbers whose GCF is 645?"

What two numbers have a GCF of 646?
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