The quickest way to mark the children's responses is to use the Activity Marking section of your Marking Centre.
This shows you all the comprehensions and debates where pupils have given typed answers.
Discussion view of pupils typed answers
Click on 'Discussions' if you want to view all pupil responses, or read and discuss them with pupils on your interactive whiteboard to develop their ideas and answers. 
Giving points and feedback to pupils on their answer.
If you click on 'Review' next to the pupil's name, you can then award points and give typed feedback.
The points and feedback appear on their Activity Scorecard in their Activity Library.