What two numbers have a GCF of 81?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 81.

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 81. Below is the beginning list of multiples of 81 (1 through 7) in numerical order.

1. 81
2. 162
3. 243
4. 324
5. 405
6. 486
7. 567
etc...

Two numbers that have a GCF of 81 can be 81 and any other number on the list above. Thus, two numbers that have a GCF of 81 are:

81 & 162
81 & 243
81 & 324
etc...

That is not all! Any combination of any multiple of 81 and "odd" multiples of 81 will also have GCF of 81. 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 81.

162 & 243
162 & 405
324 & 405
324 & 567
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 81. 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 81, what are the numbers?" or "What are two numbers whose GCF is 81?"

What two numbers have a GCF of 82?
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