I found the below question in a Russian Math book.
The number 608 now becomes 608000.
608000 - 608 = 607392 -- Is this correct? [By how many ones did the number increase?]
608000/608 = 1000 -- Is this correct? [By what factor did the number increase?]
Question:- Three zeros were added to the right of the number 608. By how many ones did the number increase? By what factor did the number increase?
The computations are correct. $608000-608=607392$ can be verified by the subtraction algorithm from elementary school. The answer to by how many ones did the number increase is $607392$. That is the point of subtraction. What they are looking for is that adding three zeros is the same as multiplying by $1000$. $608000=608\cdot 1000$, so $608000-608=608(1000-1)=608 \cdot 999=607392$