# Unit: 3. Addition and Subtraction of Whole Numbers

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### Unit Description

This is a 8 day unit that covers the addition and subtraction of whole numbers. The unit will review the basic algorithms for these 2 operations, and will place a heavy emphasis on regrouping according to place value. The unit will also present scholars with rigorous word problems that they will be expected to analyze and solve.

### Lessons

 Addition/Subtraction Week 1: Learning How to Regroup Resources: 3 SWBAT regroup numbers with and without place value blocks (preparation for adding and subtracting with regrouping). Addition/Subtraction Week 2: Addition and Subtraction of Whole Numbers Resources: 3 SWBAT add whole numbers with and without regrouping. SWBAT subtract whole number with and without grouping, including across 0s. Addition/Subtraction Week 3: Word Problems and Bar Models Resources: 14 SWBAT analyze and solve word problems using bar models. 1 Week 4: Word Problems and Bar Models 2 Resources: 5 SWBAT to analyze and solve word problems using bar models. SWBAT choose the correct operation (subtraction/addition) when doing word problems.

### Unit Resources

 AdditionandSubtractionWholeNumbersParentLetter2012.docx 1 AdditionandSubtractionWholeNumbersPerformanceTaskLetter2012.docx 1 Adding_SubtractionWholeNumbersUnit2012.doc AddSubUnitTest.doc
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