entering repeating decimals answers

I think Khan Academy's exercices accept fractions as an answer. That may be why it does not recognize the infinite decimal.

Here are two example on how to convert repeating decimals to fraction:

Most questions prefer a simplified fraction and will only accept a rounded decimal if the problem specifically states it.  In that case, it will always tell you to which place she should round.  Warning: do NOT round anything prior to the final answer!