It is a fairly simple problem from Unit 1, but the focus was on "how do you know you're right?" (that's often the tricky part of the problem!).
After giving the kids ten or so minutes to complete the problem, we looked at each other's work on the Smartboard, while each set of partners explained their work. I
It was a great learning opportunity and now that everyone is more familiar with classroom expectations, routines and some problem solving strategies, we can explore more problem solving situations such as this one...only we're takin' the level of difficulty up a notch or two! ;)