Hi! So the numbers aren't considered adjectives and they stay the same, right? (Not "zweien".) What happens with two adjectives in a row. For example, would it be "Das sind die letzten blauen Orangen"?
eine is the only number that inflects, in general. (Though some of the next few numbers have distinct genitive forms, e.g. er ist der Vater zweier Söhne "he is the father of two sons".)
Das sind die letzten blauen Orangen is correct -- both adjectives take weak inflection after the definite article die there.
Das ist = this is
Das sind = these are
Since the sentence discusses two oranges, the plural form is used.
could it be "da sind..." ? I don't think we can guess from the audio... and both would be correct German, wouldn't they ?
If you listen carefully, you can hear the "s" (like in "snake") of "das" before the "s" (like in "cars") of "sind".
You're right: "Da sind die letzten zwei Orangen" is also a valid sentence, meaning "The last two oranges are over there." However, if this were the case, I think the speaker would most likely place greater emphasis on the word "da".
"Those are the last two oranges" is the correct version; normally Duolingo distinguishes strictly between this-that, these-those.
You are right, it used to do that; but lately it has started to accept all four, which makes sense; after all reducing four English translations to one German word leads to a kind of simplified German.
It may be simplified but is it correct? Is the meaning that flexible in everyday, idiomatic German?