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Chapter 3: Number Theory

• Section 3.1: 'Multiple' Facts
• Section 3.2: Divisibility Rules for 2, 4, 5, and 25
• Section 3.2: Divisibility Rules for 3 and 9
• Section 3.3: How to Tell if a Number is Prime
• Section 3.4: Problem Solving with Prime Factorization
• Section 3.5: Least Common Multiple
• Section 3.5: Least Common Multiple Slick Trick
• Section 3.6: A Challenging Divisor Problem
• Section 3.7: Greatest Common Divisor
• Section 3.7: LCM Times GCD