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Teachers and parents who have used Challenge Math and Primary Grade Challenge Math have asked for a book for students whose skill levels fall in between these two popular resources for high ability learners. Upper Elementary Challenge Math is designed for those students in grades 3-5 who need more challenging material than they typically encounter in most math curriculums. As in other Zaccaro math books, problems are presented at 4 levels of difficulty after each chapterâ€™s instruction. In addition, each chapter includes multiple â€œproblem setsâ€ in which a single problem type is presented in increasingly complex steps, illustrating how a simpler problem can progress from 1 step to multi-step problem solving. Detailed answer section.