This third edition has been expanded with over 100 new tasks and questions that help experienced and novice teachers to effectively and efficiently differentiate mathematics instruction in grades K-8. Math education expert Marian Small shows teachers how to get started and become expert as using two powerful and universal strategies: open questions and parallel tasks. This volume includes key changes that will make it easier for teachers to use in all quality state standards environments, including direct links to Common Core content standards and standards for mathematical practice.