Matching activities with cards is not new. After sorting the cards, students can then PLAY GAMES like Statistical Rummy or Snap or use them as flash cards to study together. I have a hunch that PLAYING with them will help the knowledge to be retained.
Ideas for using them: (Lesson Plan).
These cards could be used by giving students one card each. The Vocab Card holders could be the leaders of their group. Students then try to find their group. The Question Holders and Answer Holders try to find each other. I think this could be a whole lot of fun.