Would you like to go first?
Saki shitai reba dozo.
We say this to let the other person take turn first.
What did you get for ...?
I don't know if my answer (kotae) is right. I ask for your idea for an answer. What did you get for number one?
If our answers are the same, I am happy because I think we are right. If they are different, I may think your answer is more right than mine.