T7. With a team of two or three others, keep track of each time any team member sees a fraction or percent being used outside the classroom. For example, a half-off sale, or a bank interest rate, or a recipe calling for 2 1/2 tablespoons of an ingredient.

Make up a master list for the team (eliminate duplications), and discuss why a fraction or percent is used, rather than a whole number. Also comment on why a fraction is used rather than a percent, or vice versa.