What two numbers have a GCF of 64?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 64.

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 64. Below is the beginning list of multiples of 64 (1 through 7) in numerical order.

1. 64
2. 128
3. 192
4. 256
5. 320
6. 384
7. 448
etc...

Two numbers that have a GCF of 64 can be 64 and any other number on the list above. Thus, two numbers that have a GCF of 64 are:

64 & 128
64 & 192
64 & 256
etc...

That is not all! Any combination of any multiple of 64 and "odd" multiples of 64 will also have GCF of 64. 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 64.

128 & 192
128 & 320
256 & 320
256 & 448
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 64. 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 64, what are the numbers?" or "What are two numbers whose GCF is 64?"

What two numbers have a GCF of 65?
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