One of the skills I want my students to master is the ability to defend their answers mathematically. In this activity students record all the possible answers for a game and deciding if the rules are fair for both players.
I am a third generation public school teacher who has been in education since 1987. I have taught elementary students full time for 20+ years. I am also a freelance curriculum writer. You can contact me at mrs.mjbauer(at)gmail(dot)com.