A couple of problems. You need at least two numbers to find a GCF and the GCF is by definition positive.
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The GCF is 25.
You must have at least two whole numbers to determine a greatest common factor.
The LCM of 960, 1600 is 4800.
Two pairs of numbers with a GCF of 8 and an LCM of 360 are 360 and 8 and 72 and 40
The GCF will always be a positive number.