What two numbers have a GCF of 30?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 30.

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 30. Below is the beginning list of multiples of 30 (1 through 7) in numerical order.

1. 30
2. 60
3. 90
4. 120
5. 150
6. 180
7. 210
etc...

Two numbers that have a GCF of 30 can be 30 and any other number on the list above. Thus, two numbers that have a GCF of 30 are:

30 & 60
30 & 90
30 & 120
etc...

That is not all! Any combination of any multiple of 30 and "odd" multiples of 30 will also have GCF of 30. 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 30.

60 & 90
60 & 150
120 & 150
120 & 210
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 30. The lists we created can go on forever.

Two numbers have a GCF of Calculator
Need the answer to a similar problem? Enter your GCF below to find the two numbers with that GCF.

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 30, what are the numbers?" or "What are two numbers whose GCF is 30?"

What two numbers have a GCF of 31?
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