# Unit: 3.NBT.2 Addition & Subtraction

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### Unit Description

3.NSO-C.10. Demonstrate an understanding of and the ability to use conventional algorithms for the addition and subtraction of up to five-digit whole numbers. 3.NSO-C.11. Add and subtract up to four-digit whole numbers accurately and efficiently.

### Lessons

 Adding Whole Numbers Resources: 2 Students will add multi-digit whole numbers numbers; review basic addition facts. 15,371 Developing + and - Resources: 3 Students will develop automaticity when adding and subtracting; understand the concepts of adding and subtracting. 1,730 Relating Addition and Subtraction Resources: 1 Students will explore the relationship between addition and subtraction. 6,682 Addition with Renaming Resources: 1 Students will add multi-digit numbers with renaming. 3,217 When to Regroup Resources: 1 Students will determine how and when to regroup in subtraction problem. 3,769 Subtracting Whole Numbers (Lesson 1) Resources: 1 Students will subtract 2 digit numbers with and without regroup 2,653 Subtract Whole Numbers (Lesson 2) Resources: 1 Subtract whole numbers with and without regrouping. 2,648 Subtraction with Regrouping Resources: 2 Students will be able to determine whether regrouping will be necessary in a given subtraction problem. 19,204 Many Ways to Take Away Resources: 2 Students will identify various strategies to solve subtraction problems. 2,650

### Unit Resources

 Adding Whole Numbers Quiz   Other 470