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Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9.
3 and 36 9 and 12
The pair of numbers whose GCF is 1 and LCM is 36 is 9 and 4. The numbers should be greater than their GCF and less than their LCM.
479 and 958 have a GCF of 479.
4 and 6
You need at least two numbers to find a GCF.