Fayette County Schools have been fortunate to work with the Bill and Melinda Gates Foundation to bring the Mathematics Assessment Project (MAP) to our Math Design Collaborative (MDC). Teachers are taught to use MAP's Formative Assessment Lessons (FALs but now called Classroom Challenges) to encourage student discussion and success for each topic.
100 lessons for formative assessment, some focused on developing math concepts, others on solving non-routine problems. A Brief Guide for teachers and administrators (PDF) is recommended reading before using these lessons for the first time.