J’ai bu une demi-bouteille.
J’ai bu la moitié de la bouteille.
Nous n’utilisons qu’une moitie du sac de riz.
Il mange qu’une moitie du biscuit.
Can someone explain in a different way from the lesson... which basically says they mean the same.
"Moitié" is a noun. "Demi-" is a prefix
If you go to buy (say) wine, you can buy a half bottle of wine rather than a full bottle.
Je voudrais acheter une demi-bouteille de vin.
You may then decide to drink only half of the contents (la moitié) leaving the rest until another time.
There are a number of further examples but I think that you will see the point between each word in my brief example.
Does this help?
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