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Contents: About the Investigations Curriculum, How To Use This Book, Technology in the Curriculum, About Assessment; Unit Overhead; Materials List; About the Mathematics in This Unit; About the Assessment in This Unit; Preview for the Linguistically Diverse Classroom; Investigation 1: Working with 100; Investigation 2: Exploring Multiples of 100; Investigation 3: How Much Is 1000? Investigation 4: Making a 10,000 Chart; Appendix: Ten-Minute Math; Appendix: Vocabulary Support for Second-Language Learners; Blackline Masters: Family Letter, Student Sheets, Teaching Resources, Practice Pages