Numbers, Expressions, and Equations     Lesson 1-1 Place Value Lesson 1-2 Exponents Lesson 1-3 Comparing and Ordering Whole Numbers Lesson 1-4 Rounding Whole Numbers Lesson 1-5 Estimating Sums and Differences Lesson 1-6 Estimating Products and Quotients Lesson 1-8 Order of Operations Lesson 1-9 Properties of Operations Lesson 1-10 The Distributive Property and Mental Math Lesson 1-11 Mental Math Strategies Lesson 1-13 Variables and Expressions Lesson 1-14 Properties of Equality Lesson 1-15 Solving Equations with Whole Numbers