What two numbers have a GCF of 128?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 128.

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 128. Below is the beginning list of multiples of 128 (1 through 7) in numerical order.

1. 128
2. 256
3. 384
4. 512
5. 640
6. 768
7. 896
etc...

Two numbers that have a GCF of 128 can be 128 and any other number on the list above. Thus, two numbers that have a GCF of 128 are:

128 & 256
128 & 384
128 & 512
etc...

That is not all! Any combination of any multiple of 128 and "odd" multiples of 128 will also have GCF of 128. 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 128.

256 & 384
256 & 640
512 & 640
512 & 896
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 128. 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 128, what are the numbers?" or "What are two numbers whose GCF is 128?"

What two numbers have a GCF of 129?
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