Grade 1 / Chapter 8: Two-Digit Addition and Subtraction Lesson Action Details for the Action Rationale 8.1 Add and Subtract Within 20 Delete Students already did this work in chapters 3-5. It is confusing to call it a “lesson,” but can be used for practice. 8.2 Add Tens Modify Condense these lessons so there can be more of Emphasize the “relationship between addition and subtraction” 8.3 Subtract Tens a focus on moving more quickly toward the work by presenting them as connected topics (1.NBT.C.6). that is new in first grade. 8.4 Use a Hundred Chart to Add As is 8.5 Use Models to Add As is 8.6 Make Ten to Add Modify Extend this lesson to 2 days. This is Major Work of the grade and the first time students have to compose ones to make a ten (1.NBT.C.4). Additional Resource: 8.7 Use Place Value to Add As is 8.8 Addition Word Problems As is 8.9 Related Addition and As is Subtraction 8.10 Practice Addition and As is Subtraction Rationale Chapter 8 Rule of Thumb
Grade 1 / Chapter 8: Two-Digit Addition and Subtraction Lesson Action Details for the Action Rationale 8.1 Add and Subtract Within 20 Delete Students already did this work in chapters 3-5. It is confusing to call it a “lesson,” but can be used for practice. 8.2 Add Tens 8.3 Subtract Tens Modify Condense these lessons so there can be more of a focus on moving more quickly toward the work that is new in first grade. Emphasize the “relationship between addition and subtraction” by presenting them as connected topics (1.NBT.C.6). 8.4 Use a Hundred Chart to Add As is 8.5 Use Models to Add As is 8.6 Make Ten to Add Modify Extend this lesson to 2 days. Additional Resource: This is Major Work of the grade and the first time students have to compose ones to make a ten (1.NBT.C.4). 8.7 Use Place Value to Add As is 8.8 Addition Word Problems As is 8.9 Related Addition and Subtraction As is 8.10 Practice Addition and Subtraction As is Chapter 8 Rule of Thumb Rationale
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