After the number 0.099 will the next number be 0.100

and after 0.199 will the next number be 0.200 i know it sounds like a stupid question but just need to make sure.
thanks

Yes, you're correct.

Actually, no.
An example of a "next"number would be 0.0991, or 0.0992, or even 0.09901 and so on. Numbers don't only go to three decimal places.

if they are going to the ten thousenths place, the next number is 0.0991 if not then you are correct.

If you're counting by thousands, it will be.

Yup, as long as you're dealing with decimals.

yes to both questions.