Answer :

It is 5 because you divide 45 and 270 by 5 and you get a quotient of 9 and 54 and you can't use a higher number than five
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List all the factors for 45,270 to find the common factors.
45=
−45,−15,−9,−5,−3,−1,1,3,5,9,15,45 

270=−270,−135,−90,−54,−45,−30,−27,−18,−15,−10,−9,−6,−5,−3,−2,−1,1,2,3,5,6,9,10,15,18,27,30,45,54,90,135,270

The common factors for 45,270 are −45,−15,−9,−5,−3,−1,1,3,5,9,15,45.

The GCF of the numerical factors −45,−15,−9,−5,−3,−1,1,3,5,9,15,45 is 45.

45

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