Starting lessons with a good story, captures students imagination. The story then leads nicely into a magic card experiment which can be used to help teach the topic. I have used magic with a variety of age groups and found that they ask different questions of the task, and search for different levels of answers.
"Magic Math Cards,"
The Mathematics Enthusiast: Vol. 5
, Article 14.
Available at: http://scholarworks.umt.edu/tme/vol5/iss2/14