No, it's six. 12 is not a factor of thirty.
Since 12 is a factor or 36, it is automatically the GCF.
The HCF is: 12
(12 x 2) + (12 x 3) = 12(2 + 3)
Yes.
No.
Yes - 6 is a factor of 30.
There is only one proper common factor of 12 and 38; it is 2. Mathematicians do not consider 1 to be a proper factor, because it divides everything.
1 is.
Multiples of 30
The largest prime factor of 35 is seven.
19