Addition and Subtraction Problem Types and Strategies

Join Result Unknown	Join Change Unknown	Join Start Unknown
Separate Result Unknown	Separate Change Unknown	Separate Start Unknown
Part-Part Whole/ Whole Unknown	Part-Part Whole/ Part Unknown
Compare Difference Unknown	Compare Quantity Unknown	Compare Referent Unknown

Problem Type Task

Task:
For your problem type, identify all of the possible strategies children might use to solve them using direct modeling, counting, and number facts. Create a WIKI page to record your findings.

Quality Standard

• Type of problem (Title and Connie and Juan example)
• All possible strategies (direct modeling, counting, and number facts) on a video
• Corresponding number sentence with strategy
• Written explanation of the strategy

Resources
Cognitively Guided Instruction Carpenter/Fennema

Addition and Subtractions Problem Types: Chapter 2, pg. 7-12

Addition and Subtraction Solution Strategies: Chapter 3, pg. 15-31

• Direct Modeling, pg. 15
• Counting, pg. 18
• Number Facts, pg. 24