My son is learning French, and in his school book there are example sentences for the words he has to learn. For the word dernier/dernière that sentence is:
Lundi dernier, j'ai eu 20 à mon devoir !
We can't make sense of that sentence. It seems to say, "I have had 20 to[wards]/of my homework." But what does that mean?
à means a situation ("in"), a direction ("towards"), a time ("at [4 o'clock]"), ownership ("of [someone]"), attribution ("to [someone]"), and so on, in general something like a direction towards a point in time or space or a person or thing.
So does it mean here, "I have had 20 [exercises] as/for my homework"?