What two numbers have a GCF of 55?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 55.

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 55. Below is the beginning list of multiples of 55 (1 through 7) in numerical order.

1. 55
2. 110
3. 165
4. 220
5. 275
6. 330
7. 385
etc...

Two numbers that have a GCF of 55 can be 55 and any other number on the list above. Thus, two numbers that have a GCF of 55 are:

55 & 110
55 & 165
55 & 220
etc...

That is not all! Any combination of any multiple of 55 and "odd" multiples of 55 will also have GCF of 55. 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 55.

110 & 165
110 & 275
220 & 275
220 & 385
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 55. 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 55, what are the numbers?" or "What are two numbers whose GCF is 55?"

What two numbers have a GCF of 56?
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