A factor of 1.
1
conversion factor
1
conversion fraction
No, there cannot be a zero in any scale factor.
The other factor.
Conversion factor I think it is a unit fraction?!?!?!?!?
Yes.
It cannot be factored.
1/400
The only number that is always a factor is 1. This is based on my assumption that there are no decimals in your answer.
The lowest common factor is always 1.