Third/Addition
Add 2-Digit Numbers with Regrouping ()
Add two 2-digit numbers with regrouping (carrying). Line up the numbers in columns. Example: 38 + 27 = 65
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Quick Tip
Line up the ones and tens. Add ones first. If 10 or more, carry 1 to the tens place.
Teacher Resources
Teaching Notes
Emphasize place value and the concept of regrouping ten ones as one ten. Encourage students to start adding from the ones column.
Vocabulary
Regroup: To exchange 10 ones for 1 ten, or 10 tens for 1 hundred.
Carry over: Moving a value to the next higher place value column.
Common Mistakes
- Forgetting to regroup (carry over) the tens.
- Adding the tens column before the ones column.
- Incorrectly adding the regrouped number.
Differentiation
SupportUse base ten blocks or place value charts for concrete representation.
ChallengeChallenge with mental addition strategies or three 2-digit numbers.
Discussion Questions
- Why is it important to start adding from the ones place?
- What does 'regrouping' mean when adding numbers?
- How is regrouping similar to bundling sticks or counting groups of ten?
- What would happen if you forgot to regroup in an addition problem?
Extension Activities
- Add prices with regrouping.
- Solve word problems.
- Play regrouping games.
Parent Tip
Use base-ten blocks to visually demonstrate regrouping ones into tens.
Learning Path
Skill Cluster
Number Operations and Place Value
Estimated Time
15 minutes
Skills Practiced
two digit additionaddition with regrouping
Prerequisites
- Addition: Add 2-Digit Numbers (No Regrouping)
- Place Value (Tens and Ones)
Next Steps
- Addition: Add 3-Digit Numbers (With Regrouping)
- Subtraction: Subtract 2-Digit Numbers (With Regrouping)