Since negative numbers also have positive factors, their GCF would be the same as if the original numbers were positive.
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By definition, two numbers say a and b are relatively prime if and only if the gcd (a,b) = 1.The two pairs are (5, 16) and (16, 25).
Since 1 has only one divisor - itself - the GCD of the two numbers must be 1.
The same as with positive numbers. You need at least two numbers to find a GCF.
The greatest common denominator (GCD) refers to a denominator that is COMMON to two or more numbers. You have only one number in the question! The greatest denominator of any number is itself.
You need at least two numbers to find a GCF.