"Hvor mange norske ord må vi lære?"

Translation: How many Norwegian words must we learn?

[Sapiophia]

LÆR ALLE ORDENE

[__FieryCrystal__]

JA

[hmada993]

Over tre tusen ord

[Lingvarlante]

Well, that's a good question.

[Jeannellen]

Would it also be correct to translate it as, "How many Norwegian words must we teach?"

[Deliciae]

No, "å lære" needs an indirect object to translate to "to teach" on its own:

"Hun lærte meg norsk."
"She thaught me Norwegian."

If there is no indirect object, you need to add the adverb "bort" for that meaning:

"Hun lærer bort norsk."
"She teaches Norwegian."

Without either, it just means "to learn".