What two numbers have a GCF of 661?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 661.

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 661. Below is the beginning list of multiples of 661 (1 through 7) in numerical order.

1. 661
2. 1322
3. 1983
4. 2644
5. 3305
6. 3966
7. 4627
etc...

Two numbers that have a GCF of 661 can be 661 and any other number on the list above. Thus, two numbers that have a GCF of 661 are:

661 & 1322
661 & 1983
661 & 2644
etc...

That is not all! Any combination of any multiple of 661 and "odd" multiples of 661 will also have GCF of 661. 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 661.

1322 & 1983
1322 & 3305
2644 & 3305
2644 & 4627
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 661. 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 661, what are the numbers?" or "What are two numbers whose GCF is 661?"

What two numbers have a GCF of 662?
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