What follows is a list of Explorations from the first edition of this text that were not included in the second (current) edition. These explorations are numbered and titled as they were in the first edition. The section in parentheses refers to the second edition section for which these Explorations are appropriate.

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• Exploration 1.2 Who Owes Whom How Much? (Chapter 1)
• Exploration 1.3 Budgeting Expenses (Chapter 1)
• Exploration 1.4 How Many Squares? (Chapter 1)
• Exploration 2.4 Blood Types (Section 2.1)
• Exploration 2.7 Pendulum (Section 2.2)
• Exploration 3.12 More Operation Sense: Bidding for a Job (Section 3.2)
• Exploration 3.19 Making Sense of Large Numbers (Section 3.3)
• Exploration 4.5 Paths and Orbits in Star Patterns (Section 4.3)
• Exploration 5.12 Part 1 Understanding and Creating Division Algorithms: Invert and Multiply (Section 5.4)
• Exploration 5.15 Patterns in Repeating Decimals (Section 5.4)
• Exploration 5.16 Precision and Decimals (Section 5.4)
• Exploration 6.7 Single-Parent Family (Section 6.2)
• Exploration 7.6 Making Sense of Pulse Data (Section 7.2)
• Exploration 7.9 Pig (Section 7.3)
• Exploration 7.13 Area Codes and Phone Numbers (Section 7.4)
• Exploration 8.8 Weird Triangles (Section 8.2)
• Exploration 8.9 Exploring Line Segments in Triangles (Section 8.2)
• Exploration 9.7 Lattices and Geometric Structure (Section 9.2)
• Exploration 9.13 Quilts and Proportions (Section 9.3)