Giving teachers a menu of rich mathematical experiences for all students, this dynamic resource provides strategies for developing differentiated, open-ended, and engaging problem-solving tasks. At the core of this resource are research-based assessment rubrics to inform math teaching on an ongoing basis. The nine sample rubrics feature authentic student work and allow teachers to identify how students use mathematical language, strategies, and materials; experience challenges and successes; and make connections among key mathematical ideas. More than 200 tasks grouped by content strands reflect the ideals of NCTMs Principles and Standards for School Mathematics and Curriculum Focal Points, while 60 reproducible investigations address more than one content strand and are true problem-solving applications of mathematical skills, procedures, and reasoning. The tasks can generally be completed within a short period of time, and the investigations are designed to be explored over a longer time period. The included CD contains all the reproducibles in a downloadable, printable format.