Grade 2/Addition
Mental 2-Digit Addition (752)
General two-digit mental addition including regrouping where natural.
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Teacher Resources
Teaching Notes
Model round-and-adjust and split-add methods.
Common Mistakes
- Incorrect regrouping mentally
- Forgetting to add the 'adjusted' part
- Misaligning place values
- Over-reliance on standard algorithm
Differentiation
SupportUse base ten blocks or number lines. Start with no regrouping.
ChallengeApply to larger numbers. Estimate before solving mentally.
Discussion Questions
- How does 'building a ten' help with mental addition?
- Can you explain your strategy to a partner?
- When is it easier to build a hundred first?
- What if there's no regrouping needed?
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
12 minutes
Skills Practiced
addition mental regroup
Prerequisites
- 2
- Place Value (Tens & Ones)
- Basic Addition Facts
- Adding Multiples of Ten
Next Steps
- Mental 3-Digit Addition
- Mental 2-Digit Subtraction
- Estimation with 2-Digit Numbers
- Mental 2-Digit Subtraction (Regrouping)