Simple question: what does relatively prime to a number mean

What does relatively prime to a number mean.
For example,
1, 2, 3, 4, 5, and 6 are relatively prime to 7
1, 2, 4, 5, 7, and 8 are relatively prime to 9
I know what prime numbers are... but what does the above mean and how are these numbers found?
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jtiernan2008Asked:
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ozoCommented:
Two integers are relatively prime if they share no common positive factors (divisors) except 1.
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jtiernan2008Author Commented:
thanks
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ozoCommented:
You can find the Greatest Common Divisor of two numbers using the Euclidean Algorithm
http://en.wikipedia.org/wiki/Euclidean_algorithm
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