This set includes the following 6 Mental Math Strategies: Ten Friends, Doubles, Doubles Plus One, Doubles Minus One, Double in the Middle, and Count On. There is an Anchor Chart, Flash Cards, Critical Thinking Question or Clue, Worksheet, and Common Core Standards for each strategy. In addition, is a detailed parent letter with definition and examples of each strategy. Parents are then able to use classroom terminology when assisting with practice. This is perfect for whole class introduction as well as small group review. My students love using it as practice for the game Math Around the World.