What two numbers have a GCF of 70?

Here we will explain and show you how to find what two numbers have the Greatest Common Factor (GCF) of 70.

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 70. Below is the beginning list of multiples of 70 (1 through 7) in numerical order.

1. 70
2. 140
3. 210
4. 280
5. 350
6. 420
7. 490
etc...

Two numbers that have a GCF of 70 can be 70 and any other number on the list above. Thus, two numbers that have a GCF of 70 are:

70 & 140
70 & 210
70 & 280
etc...

That is not all! Any combination of any multiple of 70 and "odd" multiples of 70 will also have GCF of 70. 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 70.

140 & 210
140 & 350
280 & 350
280 & 490
etc...

Like we stated above, there are infinite combinations of two numbers whose GCF is 70. 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 70, what are the numbers?" or "What are two numbers whose GCF is 70?"

What two numbers have a GCF of 71?
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