That's true, but you then need to carry on, treating 99 as the 3-digit number 099. You then continue by subtracting 099 from 990, etc. Eventually you will reach 495.

## That's true, but you then

That's true, but you then need to carry on, treating 99 as the 3-digit number 099. You then continue by subtracting 099 from 990, etc. Eventually you will reach 495.