GCF Math Check

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Can you see if my answers are correct?

Directions find the GCF: (I did the factor tree for each)

40; 2^3 times 5
128; 2^7
GCF: 2

90; 3^2 times 2 times 5
105; 5 times 3 times 7
180; 3^2 times 2^2 times 5
GCF: 5

3x^3; what is that suppose to be
6x; 2 times 3
12x^2; 2^2 times 3
What is the GCF is it 3x?

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