Addition with Regrouping Worksheets for Grade 4

Master advanced addition with regrouping through visual strategies, step-by-step methods, and comprehensive practice worksheets.

Solution: Exercises 1 to 3
1 Three-Digit Regrouping Problem
Exercise 1
247 + 186 = ?
Definition:

Three-digit addition with regrouping: Adding numbers with hundreds, tens, and ones places where carrying is required

Regrouping: Also called "carrying" - when we move 10 from one place value to the next higher place value

Three-Digit Addition with Regrouping Method:
  1. Line up the numbers: Ones under ones, tens under tens, hundreds under hundreds
  2. Add the ones column: 7 + 6 = 13
  3. Regroup: Write down 3, carry 1 to the tens column
  4. Add the tens column: 4 + 8 + 1 (carried) = 13
  5. Regroup again: Write down 3, carry 1 to the hundreds column
  6. Add the hundreds column: 2 + 1 + 1 (carried) = 4
  7. Write the answer: 433
Problem
247 + 186
Regrouping
Carry 1 to tens, then to hundreds
Result
433
1
1
2
4
7
+
1
8
6
=
4
3
3
Step 1: Add the ones column

7 + 6 = 13. Since 13 ≥ 10, we need to regroup.

Step 2: Write down the ones digit

Write down 3 in the ones place.

Step 3: Carry the tens digit

Carry 1 to the tens column (13 = 1 ten + 3 ones).

Step 4: Add the tens column

4 + 8 + 1 (carried) = 13. Since 13 ≥ 10, we need to regroup again.

Step 5: Write down the tens digit

Write down 3 in the tens place.

Step 6: Carry the hundreds digit

Carry 1 to the hundreds column (13 = 1 hundred + 3 tens).

Step 7: Add the hundreds column

2 + 1 + 1 (carried) = 4

Step 8: Write the final answer

The answer is 433

247 + 186 = 433
Final answer:

247 + 186 = 433

Applied rules:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Place value: Each column represents a different place value

• Carrying: Add carried digits to the next column

Tip: Always start adding from the rightmost column (ones place).
Common mistake: Forgetting to add the carried digit to the next column.
2 Four-Digit Regrouping Problem
Exercise 2
1,347 + 2,865 = ?
Definition:

Four-digit addition with regrouping: Adding numbers with thousands, hundreds, tens, and ones places where carrying is required

Carrying process: Moving 10 from one place value to the next higher place value

Problem
1,347 + 2,865
Regrouping
Carry across multiple columns
Result
4,212
1
1
1
1
3
4
7
+
2
8
6
5
=
4
2
1
2
Step 1: Add the ones column

7 + 5 = 12. Since 12 ≥ 10, we need to regroup.

Step 2: Write down the ones digit

Write down 2 in the ones place.

Step 3: Carry the tens digit

Carry 1 to the tens column (12 = 1 ten + 2 ones).

Step 4: Add the tens column

4 + 6 + 1 (carried) = 11. Since 11 ≥ 10, we need to regroup again.

Step 5: Write down the tens digit

Write down 1 in the tens place.

Step 6: Carry the hundreds digit

Carry 1 to the hundreds column (11 = 1 hundred + 1 ten).

Step 7: Add the hundreds column

3 + 8 + 1 (carried) = 12. Since 12 ≥ 10, we need to regroup again.

Step 8: Write down the hundreds digit

Write down 2 in the hundreds place.

Step 9: Carry the thousands digit

Carry 1 to the thousands column (12 = 1 thousand + 2 hundreds).

Step 10: Add the thousands column

1 + 2 + 1 (carried) = 4

Step 11: Write the final answer

The answer is 4,212

1,347 + 2,865 = 4,212
Final answer:

1,347 + 2,865 = 4,212

Applied rules:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Place value: Each column represents a different place value

• Carrying: Add carried digits to the next column

Tip: Circle or highlight the carried digit to make it visible.
Common mistake: Writing the entire sum in one column instead of carrying.
3 Advanced Regrouping Problem
Exercise 3
4,589 + 3,764 = ?
Definition:

Advanced regrouping: Addition problems with larger numbers that require careful attention to carrying

Multiple regrouping: When regrouping occurs in multiple columns

Problem
4,589 + 3,764
Regrouping
Carry across multiple columns
Result
8,353
1
1
1
4
5
8
9
+
3
7
6
4
=
8
3
5
3
Step 1: Add the ones column

9 + 4 = 13. Since 13 ≥ 10, we need to regroup.

Step 2: Write down the ones digit

Write down 3 in the ones place.

Step 3: Carry the tens digit

Carry 1 to the tens column (13 = 1 ten + 3 ones).

Step 4: Add the tens column

8 + 6 + 1 (carried) = 15. Since 15 ≥ 10, we need to regroup again.

Step 5: Write down the tens digit

Write down 5 in the tens place.

Step 6: Carry the hundreds digit

Carry 1 to the hundreds column (15 = 1 hundred + 5 tens).

Step 7: Add the hundreds column

5 + 7 + 1 (carried) = 13. Since 13 ≥ 10, we need to regroup again.

Step 8: Write down the hundreds digit

Write down 3 in the hundreds place.

Step 9: Carry the thousands digit

Carry 1 to the thousands column (13 = 1 thousand + 3 hundreds).

Step 10: Add the thousands column

4 + 3 + 1 (carried) = 8

Step 11: Write the final answer

The answer is 8,353

4,589 + 3,764 = 8,353
Final answer:

4,589 + 3,764 = 8,353

Applied rules:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Place value: Each column represents a different place value

• Carrying: Add carried digits to the next column

Tip: Practice with manipulatives like base-10 blocks to visualize regrouping.
Common mistake: Forgetting to write down the correct digit after carrying.
Addition with Regrouping Laws, Methods, and Strategies
a + b = c (with regrouping when a + b ≥ 10)
Addition with Regrouping Formula
Rule 1
Regrouping
When sum ≥ 10, carry 1
Rule 2
Place Value
Ones under ones, tens under tens
Rule 3
Carrying
Add carried digit to next column
Key definitions:

Addition with regrouping: Adding numbers where the sum in one column is 10 or more, requiring us to "carry" the extra to the next column

Regrouping: The process of converting 10 units of one place value into 1 unit of the next higher place value

Carrying: Moving a group of 10 from one column to the next column to the left

Place value: The value of a digit based on its position in a number

Column addition: Adding numbers by place value columns (ones, tens, hundreds, thousands)

Addition with regrouping methodology:
  1. Align numbers: Line up digits by place value (ones under ones, tens under tens, etc.)
  2. Add from right to left: Start with the ones column
  3. Check for regrouping: If sum ≥ 10, regroup
  4. Carry the excess: Write down the ones digit, carry the tens digit
  5. Continue to next column: Include the carried digit in the next addition
Tip 1: Always start adding from the rightmost column (ones place).
Tip 2: Circle or highlight the carried digit to make it visible.
Tip 3: Practice with manipulatives like base-10 blocks to visualize regrouping.
Tip 4: Check your answer by estimating first (e.g., 247 + 186 ≈ 250 + 190 = 440).
Common errors: Forgetting to carry, carrying the wrong digit, not adding the carried digit to the next column.
Key properties: Commutative (a+b=b+a), Associative ((a+b)+c=a+(b+c)), and Place Value apply to all addition.
Essential rules for addition with regrouping:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Place value rule: Align numbers by place value before adding

• Carrying rule: Add carried digits to the next column's sum

• Verification rule: Estimate to check if answer is reasonable

• Order rule: Always add from right to left

Comprehensive Summary

Definitions: Addition with regrouping is the process of adding numbers where the sum in one column is 10 or more, requiring us to "carry" the extra to the next column. Regrouping converts 10 units of one place value into 1 unit of the next higher place value.

Core Rules: When adding digits in any column, if the sum is 10 or greater, we must regroup by writing down the ones digit and carrying the tens digit to the next column. The carried digit must be added to the next column's sum.

Methods: 1) Align numbers by place value. 2) Add from right to left. 3) Check each column for sums ≥ 10. 4) Regroup by carrying. 5) Continue until all columns are added.

Examples: 247 + 186: 7+6=13→write 3, carry 1; 4+8+1=13→write 3, carry 1; 2+1+1=4; answer is 433. 1,347 + 2,865: 7+5=12→write 2, carry 1; 4+6+1=11→write 1, carry 1; 3+8+1=12→write 2, carry 1; 1+2+1=4; answer is 4,212.

Tips: Start from the rightmost column. Circle carried digits. Use manipulatives for visualization. Estimate first to check reasonableness.

Common Pitfalls: Forgetting to carry, carrying the wrong digit, not adding the carried digit to the next column, misaligning numbers by place value.

Memorization Aids: Remember "When the sum is 10 or more, carry the extra to the next door!"

Addition with Regrouping Strategies
📊
Regrouping Process
247 + 186: 7+6=13 → write 3, carry 1 → 4+8+1=13 → write 3, carry 1 → 2+1+1=4 → 433
When sum ≥ 10, carry the tens digit
Column Alignment
Thousands under thousands, hundreds under hundreds, tens under tens, ones under ones
Proper alignment prevents errors
Carrying Process
Add carried digit to next column's sum
Don't forget to include carried digits
Verification
Estimate: 247 + 186 ≈ 250 + 190 = 440. Actual: 433 ✓
Check reasonableness
Addition with Regrouping Steps
1
Align Numbers
2
Start Right
3
Add Column
4
Regroup if ≥10
5
Move Left
Visualization of Addition with Regrouping
Breaking down complex addition into step-by-step processes makes calculations manageable and understandable.
Practice with different strategies to strengthen addition skills!
Solution: Exercises 4 to 5
4 Word Problem with Regrouping
Exercise 4
A school has 1,247 students in the morning session and 1,865 students in the afternoon session. How many students are there in total?
Definition:

Word problem with regrouping: A real-world problem that requires addition with regrouping to solve

Total: The sum of two or more quantities

Problem
1,247 + 1,865
Regrouping
Carry across multiple columns
Result
3,112
1
1
1
1
2
4
7
+
1
8
6
5
=
3
1
1
2
Step 1: Identify the numbers

The school has 1,247 students in the morning and 1,865 students in the afternoon

Step 2: Set up the addition

1,247 + 1,865 = ?

Step 3: Add the ones column

7 + 5 = 12. Since 12 ≥ 10, we need to regroup.

Step 4: Write down the ones digit and carry

Write down 2 in the ones place, carry 1 to the tens column.

Step 5: Add the tens column

4 + 6 + 1 (carried) = 11. Since 11 ≥ 10, we need to regroup again.

Step 6: Write down the tens digit and carry

Write down 1 in the tens place, carry 1 to the hundreds column.

Step 7: Add the hundreds column

2 + 8 + 1 (carried) = 11. Since 11 ≥ 10, we need to regroup again.

Step 8: Write down the hundreds digit and carry

Write down 1 in the hundreds place, carry 1 to the thousands column.

Step 9: Add the thousands column

1 + 1 + 1 (carried) = 3

Step 10: Write the final answer

There are 3,112 students in total

1,247 + 1,865 = 3,112
Final answer:

There are 3,112 students in total.

Applied rules:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Word problem strategy: Identify key information and set up the equation

• Place value: Properly align numbers before adding

Tip: In word problems, circle numbers and underline the question.
Common mistake: Forgetting to carry when the sum is exactly 10.
5 Multi-Step Regrouping Problem
Exercise 5
A factory produced 3,874 widgets on Monday and 2,958 widgets on Tuesday. How many widgets were produced in total?
Definition:

Multi-step regrouping: Addition problems with multiple digits that require regrouping in multiple columns

Accumulation: Adding amounts collected over multiple periods

Problem
3,874 + 2,958
Regrouping
Carry across multiple columns
Result
6,832
1
1
1
3
8
7
4
+
2
9
5
8
=
6
8
3
2
Step 1: Identify the numbers

The factory produced 3,874 widgets on Monday and 2,958 widgets on Tuesday

Step 2: Set up the addition

3,874 + 2,958 = ?

Step 3: Add the ones column

4 + 8 = 12. Since 12 ≥ 10, we need to regroup.

Step 4: Write down the ones digit and carry

Write down 2 in the ones place, carry 1 to the tens column.

Step 5: Add the tens column

7 + 5 + 1 (carried) = 13. Since 13 ≥ 10, we need to regroup again.

Step 6: Write down the tens digit and carry

Write down 3 in the tens place, carry 1 to the hundreds column.

Step 7: Add the hundreds column

8 + 9 + 1 (carried) = 18. Since 18 ≥ 10, we need to regroup again.

Step 8: Write down the hundreds digit and carry

Write down 8 in the hundreds place, carry 1 to the thousands column.

Step 9: Add the thousands column

3 + 2 + 1 (carried) = 6

Step 10: Write the final answer

The factory produced 6,832 widgets in total

3,874 + 2,958 = 6,832
Final answer:

The factory produced 6,832 widgets in total.

Applied rules:

• Regrouping rule: When sum ≥ 10, carry the tens digit to the next column

• Word problem strategy: Identify key information and set up the equation

• Place value: Properly align numbers before adding

Tip: Draw a line under the addition problem to separate it from your work.
Common mistake: Forgetting to include the carried digit in the next column's sum.
Addition with Regrouping Laws, Methods, Definitions, and Expressions
a + b = c (with regrouping when a + b ≥ 10)
Addition with Regrouping Formula
Key definitions:

Addition with regrouping: Adding numbers where the sum in one column is 10 or more, requiring us to "carry" the extra to the next column

Regrouping: The process of converting 10 units of one place value into 1 unit of the next higher place value

Carrying: Moving a group of 10 from one column to the next column to the left

Place value: The value of a digit based on its position in a number

Column addition: Adding numbers by place value columns (ones, tens, hundreds, thousands)

Addition with regrouping methods:
  1. Standard algorithm: Align numbers by place value, add from right to left
  2. Base-10 blocks: Use physical blocks to visualize regrouping
  3. Expanded form: Break numbers into thousands, hundreds, tens and ones before adding
  4. Number line: Add by making jumps on a number line
  5. Partial sums: Add each place value separately
Tip 1: Always start adding from the rightmost column (ones place).
Tip 2: Circle or highlight the carried digit to make it visible.
Tip 3: Practice with manipulatives like base-10 blocks to visualize regrouping.
Tip 4: In word problems, circle numbers and underline the question.
Common errors: Forgetting to carry, carrying the wrong digit, not adding the carried digit to the next column, misaligning numbers by place value.
Key properties: Commutative (a+b=b+a), Associative ((a+b)+c=a+(b+c)), and Place Value apply to all addition.
Essential addition with regrouping laws:

• Regrouping Law: When sum ≥ 10, carry the tens digit to the next column

• Place Value Law: Align numbers by place value before adding

• Carrying Law: Add carried digits to the next column's sum

• Verification Law: Estimate to check if answer is reasonable

• Order Law: Always add from right to left

Detailed Addition with Regrouping Summary

Conceptual Understanding: Addition with regrouping builds on place value knowledge. Students must understand that 10 units of one place value equal 1 unit of the next higher place value (e.g., 10 ones = 1 ten, 10 tens = 1 hundred).

Strategic Approaches: The standard algorithm involves aligning numbers by place value, adding from right to left, and carrying when necessary. Alternative methods include using base-10 blocks, expanded form, or number lines.

Algorithm Development: Once comfortable with the conceptual understanding, students can transition to the standard algorithm where they systematically work through each column from right to left.

Word Problem Integration: Students must identify the mathematical operation within contextual problems. Key phrases like "in total," "altogether," "combined," and "sum" signal addition.

Verification Techniques: Estimation serves as a critical check: 247 + 186 should be close to 250 + 190 = 440. If the calculated answer is far from this estimate, it signals a potential error.

Common Challenges: Students often struggle with remembering to carry, carrying the wrong digit, or forgetting to add the carried digit to the next column. Systematic approaches and visual aids help address these challenges.

Practical Applications: Real-world contexts like counting objects, calculating totals, or measuring distances make addition meaningful and relevant.

Addition Properties Visual Guide
⚙️
Regrouping Process
247 + 186: 7+6=13 → write 3, carry 1 → 4+8+1=13 → write 3, carry 1 → 2+1+1=4 → 433
When sum ≥ 10, carry the tens digit
Place Value Understanding
247 = 200 + 40 + 7, 186 = 100 + 80 + 6, so 247+186 = (200+100)+(40+80)+(7+6) = 300+120+13 = 433
Separate thousands, hundreds, tens and ones
Verification Method
247 + 186 ≈ 250 + 190 = 440. Actual: 433 ✓
Estimate to check reasonableness
Word Problem Clues
"In total", "altogether", "combined", "sum" often indicate addition
Look for operational keywords
Addition Problem-Solving Process
1
Align Numbers
2
Start Right
3
Add Column
4
Regroup if ≥10
5
Verify
Addition Conceptual Understanding
Breaking down complex addition into step-by-step processes helps students understand the underlying mathematical concepts.
Master these foundational concepts for future math success!

Questions & Answers

Question: I get confused when I have to carry the number in multiple columns. How do I keep track of all the carries?

Answer: Great question! When carrying in multiple columns, treat each carry independently:

For example, in 247 + 186:

1. Add ones: 7 + 6 = 13 → Write 3, carry 1

2. Add tens: 4 + 8 + 1 (carried) = 13 → Write 3, carry 1

3. Add hundreds: 2 + 1 + 1 (carried) = 4

So 247 + 186 = 433. Always carry to the next column to the left!

Question: My child struggles with addition word problems. How can I help them identify when to add?

Answer: Look for these key words that often indicate addition:

  • Total/in all: "How many in total?" "What is the total?"
  • Combined/altogether: "Combined amount" "Altogether"
  • Sum: "Find the sum" "Added together"
  • More: "How many more" (sometimes, depending on context)

Help your child practice by having them circle numbers and underline key words in word problems. Then ask: "Are we putting things together or finding a total amount?"

Also encourage them to draw pictures or use manipulatives to visualize the problem.

Question: Sometimes my answer seems too big or too small. How do I check if it's right?

Answer: Estimation is your best tool for checking! Round the numbers to the nearest ten or hundred, then add:

For 247 + 186:

  • Round 247 to 250 and 186 to 190
  • Calculate 250 + 190 = 440
  • Your actual answer (433) should be close to 440 ✓

If your answer was 43 or 1,433, you'd know something went wrong because those aren't close to 440.

You can also think about the problem context: If you started with about 250 items and added about 190 more, you'd expect to have around 440 items, not 43 or 1,433.