This past year was my first year using common core state standards. I have been through a lot of professional development sessions and I've learned quite a bit from my students. Through these experiences I've created a new game I used as a review in my classroom... I REALLY wish I had this the first time around!
The game uses common core ratios, unit rate, and proportion problems. As the students walk into the classroom, I give them each a game card. Students then solve the problem and find the answer. (I post the answer cards in the classroom before the students arrive.) Students then return to their seats and share their strategies.
You can repeat this game and the strategy sharing as many times as you wish. My student REALLY learned a lot by sharing their ideas!