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Grade 2/Subtraction

3-Digit Subtraction with Regrouping

Practice subtracting 3-digit numbers from 3-digit numbers with borrowing.
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⭐ Easy4
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🔥 Hard4
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Teacher Resources
Lesson Plan

Regrouping in Subtraction

Standards
3.NBT.A.2
Printable Aids
Base Ten BlocksPlace Value Mat
Teaching Notes

Emphasize the importance of place value understanding when regrouping. Use manipulatives like base-ten blocks to model the borrowing process visually before transitioning to the standard algorithm. Encourage students to check their answers using addition.

Vocabulary
Regrouping: Exchanging tens for ones or hundreds for tens.
Column Subtraction: Subtracting numbers in aligned columns.
Common Mistakes
  • Subtracting top from bottom regardless of value (e.g., for 4-9, writing 5).
  • Forgetting to decrease the neighbor by 1 after borrowing.
  • Aligning columns incorrectly.
  • Forgetting to regroup (borrow) or regrouping incorrectly.
  • Subtracting the smaller digit from the larger digit regardless of position (e.g., 4 - 7 instead of 14 - 7).
  • Errors in basic subtraction facts after regrouping.
Differentiation
SupportProvide problems with only one instance of borrowing (e.g., only in the ones place). Use a place value chart as a visual aid. Practice with 2-digit borrowing first.
ChallengeChallenge with problems involving borrowing across zeros (e.g., 400 - 123). Introduce estimation strategies for checking answers before solving.
Discussion Questions
  • When do we need to regroup when subtracting two numbers?
  • How is regrouping in subtraction similar to carrying over in addition?
  • If you have 3 tens and need to subtract 5 ones, what steps do you take?
Extension Activities
  • Subtract larger 3-digit numbers.
  • Create word problems with regrouping.
  • Use base-ten blocks to model subtraction.
Parent Tip

Have your child explain the regrouping steps aloud.

Learning Path
Skill Cluster

Place Value & Operations

Grade Level

2-4

Skills Practiced
three digit subtractionsubtraction with regroupingplace value arithmetic
Prerequisites
  • Column Subtraction
  • Place Value
  • Subtract 2-digit numbers with borrowing
  • Understanding place value up to hundreds
  • Mastery of basic subtraction facts
Next Steps
  • Multi-Step Problems
  • Checking Subtraction with Addition
  • Subtract 3-digit numbers with borrowing across zeros
  • Subtract 4-digit numbers with borrowing
  • Subtract 3-Digit from 3-Digit (No Borrowing)
  • Subtract 4-Digit Numbers with Regrouping
  • Estimate Differences (3-Digit)