What two numbers have a GCF of 648?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 648.

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 648. Below is the beginning list of multiples of 648 (1 through 7) in numerical order.

1. 648
2. 1296
3. 1944
4. 2592
5. 3240
6. 3888
7. 4536
etc...

Two numbers that have a GCF of 648 can be 648 and any other number on the list above. Thus, two numbers that have a GCF of 648 are:

648 & 1296
648 & 1944
648 & 2592
etc...

That is not all! Any combination of any multiple of 648 and "odd" multiples of 648 will also have GCF of 648. 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 648.

1296 & 1944
1296 & 3240
2592 & 3240
2592 & 4536
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 648. 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 648, what are the numbers?" or "What are two numbers whose GCF is 648?"

What two numbers have a GCF of 649?
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