2-Digit Subtraction with Regrouping (1-Digit) (247)

Lesson Plan

Subtracting Single Digits

Standards

Printable Aids

Teaching Notes

This collection focuses on introducing and practicing subtraction with regrouping (borrowing) from a two-digit number. Emphasize the concept of exchanging one 'ten' for ten 'ones' when the ones digit in the top number is smaller than the bottom. Using manipulatives like base-ten blocks can greatly aid understanding.

Vocabulary

Regrouping: Exchanging a ten for ten ones.

Borrowing: Taking from a higher place value.

Common Mistakes

• Forgetting to regroup/borrow from the tens place.
• Subtracting the smaller digit from the larger digit regardless of its position (e.g., 2 - 7 becomes 5 instead of regrouping).
• Incorrectly subtracting from the tens column after regrouping.

Differentiation

Discussion Questions

• Why do we need to 'borrow' or 'regroup' when subtracting some numbers?
• How does understanding place value help us with regrouping?
• Can you think of a real-life situation where you might need to subtract a small number from a larger two-digit number?

Extension Activities

• Use base-ten blocks.
• Draw the regrouping.
• Number line jumps.

Parent Tip

Use play money (dimes and pennies) to model regrouping for subtraction.

Skill Cluster

Subtraction with Regrouping

Grade Level

2-3

Skills Practiced

Prerequisites

• Basic Subtraction Facts
• Place Value
• Subtract 1-Digit from 2-Digit (No Regrouping)
• Place Value (Tens and Ones)
• Basic Subtraction Facts within 20

Next Steps

• Two-Digit Subtraction
• Regrouping Strategies
• Subtract 2-Digit from 2-Digit Numbers (Regrouping)
• Subtract from 100 with Regrouping
• Subtract 2-Digit from 3-Digit Numbers (Regrouping)
• Mixed Subtraction Practice (2-Digit)