Grade 2/Addition
Add 3-Digit and 1-Digit Numbers (425)
Add a 1-digit number to a 3-digit number. Watch for carrying (regrouping). Example: 865 + 5 = 870
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Quick Tip
Start with the ones place. If the sum is 10 or more, carry to the tens place.
Teacher Resources
Teaching Notes
Emphasize understanding place value when adding. Guide learners through the regrouping process, explaining why and when to 'carry over' tens.
Vocabulary
Place value: The value of a digit based on its position.
Hundreds: The place value for 100s.
Common Mistakes
- Forgetting to regroup or 'carry over' tens.
- Adding digits in the incorrect place value column.
- Errors in basic addition facts (e.g., 5+5=11 instead of 10).
Differentiation
SupportUse manipulatives or a place value chart to visualize regrouping.
ChallengeChallenge with mental math or create word problems involving the skill.
Discussion Questions
- When do we need to regroup when adding numbers?
- How does understanding place value help us add larger numbers?
- Can you explain regrouping to a friend using an example?
- What are some real-life situations where you might add numbers like these?
Extension Activities
- Add 3-digit and 2-digit numbers.
- Use base-ten blocks for practice.
Parent Tip
Count 125 items, then add 3 more.
Learning Path
Skill Cluster
Number Sense and Operations
Estimated Time
15 minutes
Skills Practiced
add 3 digit and 1 digit numbersplace value addition
Prerequisites
- Add 2-Digit Numbers
- Place Value to Hundreds
Next Steps
- Add Multi-Digit Numbers
- Subtract 3-Digit and 1-Digit Numbers
- Add 3-Digit and 2-Digit Numbers
- Add 3-Digit Numbers