Grade 2/Subtraction
Subtract 1-Digit from 3-Digit Numbers with Regrouping (248)
Practice subtracting a single digit from three-digit numbers to develop multi-digit subtraction confidence.
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Teacher Resources
Lesson Plan
Subtracting Single Digits
Standards
2.NBT.B.5Printable Aids
Hundreds ChartBase Ten Blocks Guide
Teaching Notes
Introduce subtraction of 1-digit from 3-digit numbers, emphasizing the concept of regrouping (borrowing). Use place value charts or base-ten blocks to model the decomposition of tens or hundreds when necessary, connecting concrete representations to the standard algorithm.
Vocabulary
Hundreds: The place value for 100s.
Regrouping: Exchanging place values to subtract.
Common Mistakes
- Forgetting to regroup or 'borrow' when the ones digit in the minuend is smaller than the subtrahend.
- Incorrectly regrouping, such as borrowing from the hundreds place when only the tens place is needed for regrouping.
- Misaligning digits when setting up the problem, leading to incorrect calculations.
Differentiation
SupportProvide manipulatives like base-ten blocks or drawn models on a place value chart. Use simpler numbers or guide students step-by-step through the regrouping process.
ChallengeIntroduce problems with multiple regroupings (e.g., 3-digit from 3-digit numbers). Challenge students to explain their reasoning or create their own problems.
Discussion Questions
- Why do we sometimes need to 'borrow' or regroup when subtracting?
- How does understanding place value help us with regrouping?
- Can you explain the steps to regroup when subtracting from the tens place? From the hundreds place?
Extension Activities
- Use base-ten blocks.
- Draw the regrouping steps.
- Work backwards.
Parent Tip
Use place value disks or drawings to show borrowing across zeros.
Learning Path
Skill Cluster
Multi-Digit Subtraction
Grade Level
2-3
Skills Practiced
3 digit minus 1 digitregrouping across zerosmulti step subtraction
Prerequisites
- Basic Subtraction Facts
- Place Value
- Subtraction facts within 20
- Place value to 1000
- Subtracting 1-digit from 2-digit numbers (with regrouping)
Next Steps
- Two-Digit Subtraction
- Regrouping Strategies
- Subtracting 2-digit from 3-digit numbers (with regrouping)
- Subtracting 3-digit from 3-digit numbers (with regrouping)
- Subtraction within 1000
- Subtract 2-Digit from 3-Digit Numbers with Regrouping
- Subtract 3-Digit from 3-Digit Numbers with Regrouping
- Subtraction within 1000 (Regrouping)
