What two numbers have a GCF of 39?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 39.

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 39. Below is the beginning list of multiples of 39 (1 through 7) in numerical order.

1. 39
2. 78
3. 117
4. 156
5. 195
6. 234
7. 273
etc...

Two numbers that have a GCF of 39 can be 39 and any other number on the list above. Thus, two numbers that have a GCF of 39 are:

39 & 78
39 & 117
39 & 156
etc...

That is not all! Any combination of any multiple of 39 and "odd" multiples of 39 will also have GCF of 39. 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 39.

78 & 117
78 & 195
156 & 195
156 & 273
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 39. 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 39, what are the numbers?" or "What are two numbers whose GCF is 39?"

What two numbers have a GCF of 40?
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