Grade 2/Addition
Add Whole Hundreds (755)
Fluency adding whole hundreds to 2- and 3-digit numbers.
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Teacher Resources
Teaching Notes
Anchor on hundreds, keep tens/ones fixed.
Common Mistakes
- Forgetting place value
- Adding to wrong digit
- Ignoring other digits
- Incorrect mental adjustment
Differentiation
SupportUse base ten blocks or number lines.
ChallengeAdd whole hundreds to 4-digit numbers.
Discussion Questions
- How does adding hundreds change only the hundreds place?
- Why is mental math for hundreds useful?
- Can we use this strategy for tens?
- How is this similar to skip counting by hundreds?
Learning Path
Skill Cluster
Number Sense & Mental Math
Estimated Time
9 minutes
Skills Practiced
add whole hundreds
Prerequisites
- add_whole_tens
- Place Value to Hundreds
- Counting by Hundreds
- Adding 3-Digit Numbers (No Regrouping)
Next Steps
- Subtract Whole Hundreds
- Add Whole Tens - Mental Math
- Multi-Digit Addition Strategies
- Add Whole Hundreds - Set B
- Subtract Whole Hundreds - Mental Math