Coprime (or Relatively Prime or Mutually Prime) numbers
have no common factors other than 1
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Notes About Coprimes
Coprimes have no common factors (other than 1) so the greatest common factor of coprimes is 1
When we simplify a fraction as much as possible, then the top and bottom numbers (the numerator and denominator) are coprime.
If the top and bottom numbers of a fraction are not coprime, then we can simplify it more.