What two numbers have a GCF of 27?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 27.

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 27. Below is the beginning list of multiples of 27 (1 through 7) in numerical order.

1. 27
2. 54
3. 81
4. 108
5. 135
6. 162
7. 189
etc...

Two numbers that have a GCF of 27 can be 27 and any other number on the list above. Thus, two numbers that have a GCF of 27 are:

27 & 54
27 & 81
27 & 108
etc...

That is not all! Any combination of any multiple of 27 and "odd" multiples of 27 will also have GCF of 27. 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 27.

54 & 81
54 & 135
108 & 135
108 & 189
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 27. 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 27, what are the numbers?" or "What are two numbers whose GCF is 27?"

What two numbers have a GCF of 28?
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