Hyphenating with « cents »

Question

Why is the example « deux-cents » hyphenated, but « J’ai cinq cents euros. »  is not hyphenated ?  Thank you.

Accepted Answer

Bonjour Karen,
Following the 1990 Spelling Reform, it is recommended to hyphenate numbers written in letters. 
If you want to mention the number in letters only -> deux-cents - deux-cent-trente-cinq / cinq-cents - cinq-cent-trente-cinq 
If you want to mention euros you can find both (hyphenated as per the Spelling Reform and not as per the older grammar rule) -> deux cents euros - deux cent trente-cinq euros - deux-cent-trente-cinq euros / cinq cents euros - cinq cent trente-cinq euros - cinq-cent-trentre-cinq euros                                            
I hope this is helpful.
Bonne journée !