Column Addition: 3-Digit Regrouping (761)

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

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?

Skill Cluster

Number Sense & Operations

Estimated Time

10 minutes

Skills Practiced

Prerequisites

• place_value_basics
• mental_addition_basics
• Single-Digit Addition (Basic Facts)
• Place Value (Tens and Hundreds)
• Column Addition (No Regrouping)

Next Steps

• Multi-Digit Subtraction (Regrouping)
• Addition Word Problems
• Estimation Strategies for Sums
• Column Addition: 4-Digit Regrouping
• Column Subtraction: 2 and 3-Digit Regrouping
• Addition Word Problems (2 & 3-Digit)