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Q: What pairs of numbers has a greatest common factor of 15?

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An infinite number of number pairs have a greatest common factor of 850. One example is 1700 and 2550.

There are many pairs of numbers that have a greatest common factor of 7. Examples: 7, 14 21, 49 35, 63 147, 700 161, 343

There are several possibilities of pairs of numbers whose greatest common factor is 18. 54 and 198 18 and 126 414 and 846 72 and 1422

12 and 24 12 and 36 24 and 36

The greatest common factor of 20 and 27 is 1.To answer this we must begin by factoring both 20 and 27:The factor pairs of 20 are (1,20), (2,10), and (4,5). The prime facrorization is 2*2*5.The factor pairs of 27 are (1,27), (3,9). The prime factorization is 3*3*3.Now we look to see what factors are common, or what factors are in both trees? With these two numbers the only common factor and the greatest common factor are the same - 1.

Related questions

They are called relative prime numbers.

Here are pairs of numbers with 6 as their greatest common factor: 6, 18 12, 30 120, 126 306, 318 6 and 12

The factor pairs of 8 are (8,1)(4,2) The GCF requires at least two numbers.

14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.

An infinite number of number pairs have a greatest common factor of 850. One example is 1700 and 2550.

In that case, one of the numbers is a multiple of the other.

5 and 10 10 and 15

6 and 12 6 and 18

8 and 16 8 and 24

7 and 14 21 and 28

200,205 15,20 65,75 85,100

10 and 15

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