What two numbers have a GCF of 780?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 780.

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 780. Below is the beginning list of multiples of 780 (1 through 7) in numerical order.

1. 780
2. 1560
3. 2340
4. 3120
5. 3900
6. 4680
7. 5460
etc...

Two numbers that have a GCF of 780 can be 780 and any other number on the list above. Thus, two numbers that have a GCF of 780 are:

780 & 1560
780 & 2340
780 & 3120
etc...

That is not all! Any combination of any multiple of 780 and "odd" multiples of 780 will also have GCF of 780. 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 780.

1560 & 2340
1560 & 3900
3120 & 3900
3120 & 5460
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 780. 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 780, what are the numbers?" or "What are two numbers whose GCF is 780?"

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