Three digit addition and subtraction I'd like to know, in our primary school, we used the method of addition, subtraction, multiplication and division. How many miles can a three digit, ten hundred evolve into? How many miles at most?

Three digit addition and subtraction I'd like to know, in our primary school, we used the method of addition, subtraction, multiplication and division. How many miles can a three digit, ten hundred evolve into? How many miles at most?

I don't quite understand the question. What does it mean? Three digits, 999 at most