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EnVision Math Unit Lesson Plan Grade Level: Second Grade Topic 11: Three-Digit Addition and Subtraction Instructional Emphasis: Numbers and Operations in Base Ten Big Ideas: There are a variety of ways to add three-digit numbers. There is more than one way to do a mental calculation. Techniques for doing addition or subtraction calculations mentally involve changing the number or the expression son the calculation is easy to do mentally. The standard addition algorithm for three-digit numbers breaks the calculation into simpler calculations using place-value starting with the ones, then the tens, and then the hundreds. There is a variety of ways to subtract three-digit numbers. The standard subtraction algorithm for three-digit numbers breaks the calculation into simpler calculations using place-value starting with the ones, then the tens, and then the hundreds. Some problems can be solved by reasoning about the conditions in the problem. Lesson 1: Exploring Adding ThreeDigit Numbers Vocabulary: Vocabulary: Objective: Children will explore different strategies for adding three-digit numbers. Objective: Children will add three-digit numbers mentally without regrouping. Materials: Place-Value Blocks 11.1 11.3 11.4 11.5 Content Reviewed: Add Three Numbers; Identify Place-Value Relationships; Compare Numbers to 1,000 Materials: Place-Value Blocks 11.1 Standard: Lesson 2: Mental Math Content Reviewed: Subtract 10; Explore Adding Three-Digit Numbers; Order Multi-Digit Numbers; Recall Basic Addition Facts Standard: 2.NBT.7; 2.NBT.8; Common Core Standards: 2.NBT.7; 2.NBT.8; 2.NBT.9 Essential Questions: What strategies can you use to add three-digit numbers? How can you use mental math to add multiples of 100 to a threedigit number? How can you model and record adding 2 three-digit numbers? How do you add 2 three-digit numbers using paper and pencil? What strategies can you use to subtract three-digit numbers? How can you count on or count back to find a missing part? How can you regroup a hundred when you need to subtract more tens than are present in the tens place? How do you subtract 2 three-digit numbers using paper and pencil? How can you use logical reasoning to help solve a problem? Lesson 3: Models for Adding with Three-Digit Numbers Vocabulary: Objective: Children will use placevalue blocks to add 2 threedigit numbers with regrouping. Materials: Place-Value Blocks 11.3 11.4 11.5 Content Reviewed: Apply Expanded Notation; Use Mental Math to Add; Three-Digit Addition Standard: Created by Mike Skazinski 2014 Lesson 4: Adding Three-Digit Numbers Vocabulary: Objective: Children will use paper and pencil to add 2 three-digit numbers with regrouping. Materials: 11.3 11.4 11.5 Content Reviewed: Skip Count by 10s; Add Two-Digit Numbers; Identify Expanded Notation Lesson 5: Exploring Subtracting Three-Digit Numbers Vocabulary: Objective: Children will explore different strategies to subtract three-digit numbers. Materials: Place-Value Blocks 11.9 11.10 11.11 Content Reviewed: Compare Numbers; Add Three-Digit Numbers Standard: 2.NBT.7; 2.NBT.9 Standard: 2.NBT.7 2.NBT.7; 2.NBT.8; 2.NBT.9 Assessment 2.NBT.9 Assessment 2.NBT.9; 2.NBT.7 Assessment Assessment Topic 11 Introduction Daily Common Core Review Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Daily Common Core Review Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Daily Common Core Review Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Daily Common Core Review Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Lesson 6: Mental Math: Ways to Find Missing Parts Vocabulary: Lesson 7: Models for Subtracting with Three-Digit Numbers Vocabulary: Lesson 8: Subtracting Three-Digit numbers Vocabulary: Lesson 9: Problem Solving: Use Logical Reasoning Vocabulary: Objective: Children will be given a quantity and one its parts, and then will find the missing part by counting on or counting back. Objective: Children will use models to subtract three-digit numbers with regrouping. Objective: Children will subtract threedigit numbers using a standard algorithm. Objective: Children will use logical reasoning to solve problems. Materials: Place-Value Mat B 11.9 11.10 11.11 Materials: 11.9 11.10 11.11 Materials: Place-Value Blocks 11.7 Content Reviewed: Order Three-Digit Numbers; Identify Numbers as Odd or Even; Add Three-Digit Numbers; Subtract TwoDigit Numbers Content Reviewed: Find Missing Parts; Add Three-Digit Numbers; Identify Place-Value Relationships Standard: Standard: 2.NBT.7; 2.NBT.8; 2.NBT.9 2.NBT.9; 2.NBT.7 Assessment Daily Common Core Review Assessment Daily Common Core Review Materials: 11.12 11.8 11.6 Content Reviewed: Add Three-Digit Numbers; Subtract Two- and ThreeDigit Numbers; Subtract Three-Digit Numbers Content Reviewed: Use Mental Math to Add; Identify Relationships Between Digits; Compare Three-Digit Numbers Standard: Standard: 2.NBT.7; 2.NBT.9 2.NBT.7 Assessment Daily Common Core Review Created by Mike Skazinski 2014 Assessment Daily Common Core Review Assessment Daily Common Core Review Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Created by Mike Skazinski 2014 Problem-Based Interactive Learning Guided Practice Independent Practice Problem Solving Reteaching, Practice, and Enrichment Homework Topic 11 Assessment