I do not understand why the expression correctly reads dix heures vingt-trois instead of more simply dix heures vingt trois? In other words what is the rule for adding a hypen in this expression. I did not see this need to add hyphen mentioned in the lesson.
Here is the link on how to write numbers in French (see beginning of the lesson):
For numbers between 20 and 69, they follow this pattern: ...-et-un / ...-deux / ...-trois etc
I hope this is helpful.
Bonne journée !
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