Add 3-Digit Numbers with Regrouping (440)

Teaching Notes

Emphasize place value alignment and regrouping from ones to tens, and tens to hundreds. Use base-ten blocks or drawings to visualize the process.

Vocabulary

Regrouping: Exchanging 10 of one place value for 1 of the next higher.

Sum: The result of adding numbers together.

Common Mistakes

• Forgetting to regroup (carry over) a ten or a hundred.
• Adding digits in the wrong place value column.
• Incorrectly adding the regrouped number.

Differentiation

Discussion Questions

• Why is it important to line up numbers by place value?
• What happens when the sum of two digits is 10 or more?
• How is adding 3-digit numbers similar to adding 2-digit numbers?
• Can you think of a real-life situation where you would add 3-digit numbers?

Extension Activities

• Add larger numbers.
• Solve multi-step problems.
• Create addition challenges.

Parent Tip

Use play money to model regrouping tens into hundreds during addition.

Skill Cluster

Whole Number Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Adding 2-Digit Numbers with Regrouping
• Place Value to Hundreds
• Basic Addition Facts

Next Steps

• Subtracting 3-Digit Numbers with Regrouping
• Adding 4-Digit Numbers with Regrouping
• Addition: Add 2-Digit Numbers (With Carrying)
• Addition: Add 3-Digit Numbers (No Carrying)
• Subtraction: Subtract 3-Digit Numbers (With Regrouping)