What two numbers have a GCF of 642?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 642.

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 642. Below is the beginning list of multiples of 642 (1 through 7) in numerical order.

1. 642
2. 1284
3. 1926
4. 2568
5. 3210
6. 3852
7. 4494
etc...

Two numbers that have a GCF of 642 can be 642 and any other number on the list above. Thus, two numbers that have a GCF of 642 are:

642 & 1284
642 & 1926
642 & 2568
etc...

That is not all! Any combination of any multiple of 642 and "odd" multiples of 642 will also have GCF of 642. 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 642.

1284 & 1926
1284 & 3210
2568 & 3210
2568 & 4494
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 642. 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 642, what are the numbers?" or "What are two numbers whose GCF is 642?"

What two numbers have a GCF of 643?
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