What is the difference between "trinkst" and "trinke"?

Idon't understand what i am supposed to do,can someone translate ? it says: berechne.runde sinnvollbtw it's math: /

How do you say i love you in german

When you use construct a sentence in german in past tense for example i drank milk on monday in the caravan the last tense version ich getrinken milsch am montag in mine whonwagen how would you put this is the write order if the sentence