Unit 3
Addition & Subtraction of Whole Numbers & Decimals
Unit 3: Lesson 4 Adding and Subtracting Decimals (Focus on "Lining up place value" or "Lining up the decimals")
Unit 3: Lesson 4 Adding and Subtracting Decimals (Example problems that have been lined up correctly.
Unit 3: Lesson 11 Properties and Strategies (Commutative/Associative Properties of Addition)
Unit 3: Lesson 11 Properties and Strategies (Distributive Property)