Kwiziq, I think this lesson needs a little reviewing!! There's much confusion in this for learners at the minute.
"This is a number written in French: "14,052" How would it be expressed in English?"
The correct answer to this is also '14,052' fourteen thousand and fifty two, but I'm told the answer is incorrect. The only reason you would ever put a fullstop in there '14.052' would be to express a very accurate measurement for example '14.052g' - fourteen point zero five two grams.