Translation:The team has five thousand fans.
We had started doing it, but then we stopped, because we considered that most learners would use the numbers instead of their Greek names. Plus, in a formal text you have to write the numbers in Greek (except big numbers) and you also know how to use the numbers. There is no need to teach this ;)
Also very important if you want to understand the spoken word. I find Lotto played in the village square very useful but the consequences of a mistake can be horribly embarrassing!
Curious - it accepts "5 thousand" but not 5000. Incidentally in English it is generally accepted practice to write out the words for numbers 1-9, but use numerals above this - I don't know whether it is the same in Greece.
I understand the desire to encourage people to learn the words for numbers- but I am learning Greek not English, so having numerals in English is convenient.