Subtraction in Columns: 3-digit (Regrouping) (793)

Teaching Notes

Draw arrows to track borrows.

Vocabulary

Regroup: Borrowing from a higher place value.

Place Value: Position of a digit in a number.

Common Mistakes

• not decreasing next place
• Forgetting to regroup
• Incorrectly regrouping
• Not aligning digits
• Subtracting smaller from larger digit

Differentiation

Discussion Questions

• When do we need to regroup in subtraction?
• Why is checking with addition important?
• How does place value help with subtraction?
• Can you explain regrouping to a partner?

Extension Activities

• Create word problems.
• Subtract larger numbers.
• Use base-ten blocks.

Parent Tip

Ask your child to explain how they regrouped to solve a problem.

Skill Cluster

Number Sense and Operations

Estimated Time

14 minutes

Skills Practiced

Prerequisites

• Two-digit Subtraction with Regrouping
• Place Value to Thousands

Next Steps

• Multi-Digit Subtraction with Zeros
• Subtraction with Larger Numbers
• Subtraction in Columns: 4-digit (Regrouping)
• Subtraction in Columns: With Zeros