What two numbers have a GCF of 63?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 63.

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 63. Below is the beginning list of multiples of 63 (1 through 7) in numerical order.

1. 63
2. 126
3. 189
4. 252
5. 315
6. 378
7. 441
etc...

Two numbers that have a GCF of 63 can be 63 and any other number on the list above. Thus, two numbers that have a GCF of 63 are:

63 & 126
63 & 189
63 & 252
etc...

That is not all! Any combination of any multiple of 63 and "odd" multiples of 63 will also have GCF of 63. 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 63.

126 & 189
126 & 315
252 & 315
252 & 441
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 63. 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 63, what are the numbers?" or "What are two numbers whose GCF is 63?"

What two numbers have a GCF of 64?
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