This is a Number Sense Unit that contains one real world task and 16 activities that build upon each other. Most activities incorporate the use of mathematical modeling including pictographs, charts, T-Bars, geometric models, and two-dimensional graphing and the use of a novel manipulative. The activities were designed to develop a deeper and richer fluency of number sense while addressing each of the common core 8th grade number sense curriculum standard goals. In addition, this unit prepares students for a smooth transition into the next 8th grade common core domain, Expressions and Equations, by addressing the correct format for writing the multiplication of numbers and or variables, algebraic terms and expressions, and writing pattern rules. Teacher notes are included as a concept guide for each activity, solutions are provided, and student worksheets are included.