Grade 2/Addition
3-Digit Column Addition with Regrouping (229)
Add pairs of 3-digit numbers (may require carrying).
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Teacher Resources
Lesson Plan
Adding 3-Digit Numbers
Standards
3.NBT.A.2Printable Aids
Place Value ChartGrid Paper
Teaching Notes
Emphasize place value and the regrouping (carrying) process, starting addition from the ones column. Use base-ten blocks to model regrouping.
Vocabulary
Regroup: Exchange 10 ones for 1 ten, or 10 tens for 1 hundred.
Column: Numbers stacked vertically.
Common Mistakes
- Forgetting to carry a regrouped ten or hundred.
- Adding columns from left to right instead of right to left.
- Incorrectly adding basic facts within a column.
Differentiation
SupportProvide manipulatives (base-ten blocks), use partial sums strategy, or provide partially completed problems.
ChallengeIntroduce problems with three 3-digit addends, explore estimation strategies, or present addition in word problems.
Discussion Questions
- Why is it important to start adding from the ones column?
- What does 'carrying over' or 'regrouping' mean in addition?
- How is adding three-digit numbers similar to adding two-digit numbers?
Extension Activities
- Add three 2-digit numbers.
- Use play money to model regrouping.
- Create your own problems.
Parent Tip
Ask your child to explain how they regrouped numbers.
Learning Path
Skill Cluster
Number Sense & Operations
Grade Level
2-3
Skills Practiced
addition with regroupingplace valuemental math
Prerequisites
- 2-Digit Addition
- Place Value
- 2-digit addition with regrouping
- Place value (hundreds, tens, ones)
- Basic addition facts to 20
Next Steps
- 4-Digit Addition
- Addition Word Problems
- Subtract 3-digit numbers with regrouping
- Add three 3-digit numbers
- Solve 3-digit addition word problems
- Subtract two 3-digit numbers in columns
- Add three 3-digit numbers in columns