1290 doesn't have any factors that are perfect squares other than 1.
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You need at least two numbers to find a GCF. If that's 12 and 8, the GCF is 4.
The greatest factor of any number is the number itself.
The greatest factor of 24 is 24. The greatest factor of a number is the number itself.
List the factors.Use factor trees.Use factor rainbows.
the greatest common factor is 1 because it's the only factor of 10 that 17 can be divided by without a remainder.