Defines number sense and gives suggestions and activities for teachers to use in helping students develop number sense, including using process questions, using writing assignments, encouraging invented methods, using appropriate calculation tools, helping students establish benchmarks, and promoting internal questioning. (MKR)

Details six activities that utilize data contained in a telephone book. Topics include data display, fractional numeracy, random art, estimation, and probability. Contains a summary and extension activities, some of which focus on permutations and combinations. (DDR)