Their task was to decide on the answer and write an explanation to show their thinking. They would then bring this to me, but the obstacle is that I can ask anyone from the group to explain how they got the answer. If they could not give a clear explanation that shows they have understood they have to go back and work on it again. If they did, they would be given a new question.
It was really interesting to see this in action, especially watching some of the children having to take the role of the teacher - also having to keep their frustration in check!
30mins later...no clear explanations given yet. Also noticed one child not getting involved in the group - so had to talk to the rest of that group and ask them how they were going to ensure that this person became more responsible towards their group. However, the rest of the class were engaged and taking responsibility for their group to succeed and for them to try and understand from their peers.