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Fifth/Addition

Column Addition: 3-Digit Regrouping

Practice column addition with 3-digit numbers, including regrouping.
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Study Guide

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Practice Questions

  1. 143 + 289 = ?
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    432

  2. 268 + 137 = ?
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    405

  3. 354 + 478 = ?
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    832

  4. 219 + 406 = ?
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    625

  5. 305 + 197 = ?
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    502

Teacher Resources
Teaching Notes

Model ones→tens→hundreds addition. Write carries above the next column.

Common Mistakes
  • Digits not aligned by place value
  • Carry written but not added in next column
  • Regrouping into the wrong place (adding 10 to ones)
  • Forgetting to carry a regrouped digit.
  • Incorrectly adding the carried digit.
  • Misaligning digits by place value.
  • Adding columns from left to right.
Differentiation
SupportUse base-ten blocks or visual aids to demonstrate regrouping.
ChallengeIntroduce problems with three addends or more digits.
Discussion Questions
  • Why do we 'carry over' a number in addition?
  • How does understanding place value help with regrouping?
  • What would happen if you forgot to regroup?
  • When might you use this skill in real life?
Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

10 minutes

Skills Practiced
Column addition regroup