Grade 5/Addition
Friendly Decomposition Addition (779)
Use benchmark-friendly pairing.
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Teaching Notes
Model pairing then partial sums.
Common Mistakes
- Wrong pair total
- Incorrect decomposition.
- Forgetting remaining value.
- Misidentifying benchmark target.
- Adding partial sums incorrectly.
Differentiation
SupportUse manipulatives or number lines for decomposition.
ChallengeExtend to larger numbers or include multiple addends.
Discussion Questions
- Why is making a ten or hundred helpful?
- How does this strategy support mental math?
- When is this decomposition strategy most useful?
- Can you explain another addition strategy?
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
12 minutes
Skills Practiced
benchmark groupingmental chunking
Prerequisites
- 761
- 762
- Place Value Understanding
- Basic Addition Facts
- Number Bonds to 10
Next Steps
- Multi-Digit Addition Algorithms
- Compensation Strategy Addition
- Mental Math Fluency
- Decomposition Subtraction - Set A
- Breaking Apart Numbers Addition