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Introduction 1. Even and Odd 2. Divisibility 3. An Unorthodox Point of Entry 4. "Tricks, Bags, and Machines" 5. "Words, Signs, and Pictures" 6. Sudden Appearance of a Practical Result 7. A Miniature Problem in Design 8. Investigations 9. The Routines of Algebra I 10. The Routines of Algebra II 11. Graphs 12. Negative Numbers 13. Fractions Answers