MyMathKidK-8 Curriculum

Grade 3 Addition: 3-Digit Addition with Regrouping

Regroup across multiple columns

What You'll Learn

Regroup from ones to tens
Regroup from tens to hundreds
Handle multiple regroupings

📖Multiple Regroupings

Sometimes you need to regroup more than once. 458 + 367: First 8 + 7 = 15, carry 1. Then 5 + 6 + 1 = 12, carry 1. Finally 4 + 3 + 1 = 8. Answer: 825.

💡

Write the carried digit small above the next column so you don't forget it!

Worked examples

Real problems from the practice worksheets, solved one step at a time.

Example 1
284 + 669 = ?
1. Line up the numbers by place value.
2. Add each column from right to left.
3. Ones: 4 + 9 = 13. Write 3, carry 1.
4. Tens: 8 + 6 + 1 (carried) = 15. Write 5, carry 1.
5. Hundreds: 2 + 6 + 1 (carried) = 9
6. The answer is 953.
Answer: 953
Example 2
138 + 698 = ?
1. Line up the numbers by place value.
2. Add each column from right to left.
3. Ones: 8 + 8 = 16. Write 6, carry 1.
4. Tens: 3 + 9 + 1 (carried) = 13. Write 3, carry 1.
5. Hundreds: 1 + 6 + 1 (carried) = 8
6. The answer is 836.
Answer: 836
Example 3
214 + 129 = ?
1. Line up the numbers by place value.
2. Add each column from right to left.
3. Ones: 4 + 9 = 13. Write 3, carry 1.
4. Tens: 1 + 2 + 1 (carried) = 4
5. Hundreds: 2 + 1 = 3
6. The answer is 343.
Answer: 343

Practice Worksheets

3-Digit Addition with Regrouping (Set A)

Regroup with 3-digit numbers

3-Digit Addition with Regrouping (Set B)

More 3-digit regrouping practice

3-Digit Addition with Regrouping (Set C)

Additional 3-digit regrouping

3-Digit Addition with Regrouping (Set D)

Keep practicing 3-digit regrouping

3-Digit Addition with Regrouping (Set E)

Master 3-digit regrouping

3-Digit Addition

Mixed Multi-digit Addition