Unit 4: Using Bar Models: Addition and Subtraction
1. Using Part-Part-Whole in Addition and Subtraction
Lesson objectives:
- Use bar models to solve addition and subtraction problems.
- Apply the inverse operations of addition and subtraction.
2. Adding On and Taking Away Sets
Lesson objectives:
- Model addition as adjoining sets.
- Model subtraction as taking away.
- Apply the inverse operations of addition and subtraction.
3. Comparing Two Sets
Lesson objectives:
- Model addition and subtraction as comparing sets.
- Apply the inverse operations of addition and subtraction.
4. Real-World Problems: Two-Step Problems
Lesson objectives:
- Use bar models to solve two-step addition and subtraction problems.
- Apply the inverse operations of addition and subtraction.