I love this activity from Friday!  On Fridays, we often participate in a "problem solver".  The kids "attempt" the problem on their own and then...we get in groups to see how others solved.  ( I always make sure someone in the group solved correctly).  They share their thinking and they can change answers if they like the way someone else solved better!  This is Destiny who did a great job with make 6 groups of 10 to find the answer 60 in our problem solver.  At the end, everyone gets a treat that goes along with the learning... YES!  They are engaged learners!