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3-Digit Addition With RegroupingFREEWorksheet Generator(Grade 2)

3-Digit Addition With Regrouping worksheets (Grade 2) with step-by-step answer keys. Generate unlimited unique practice sheets with fresh problems.

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Set A • 10 Qs

PanMaths.com3-Digit Addition With Regrouping Worksheets • Set A (Medium)

Name: __________________________

Date: _____________ Period: ____

Score: _____ / 10

534

+438

332

+418

245

+167

332

+118

169

+273

207

+647

534

+207

357

+458

384

+208

436

+219

PanMaths.com • Free Math Worksheet Generator • Set A (Medium)Page 1 of 2

PanMaths.comAnswer Key & Worked Solutions • Set A (Medium)

Answer Key

Total Problems: 10

534

+438

972

1. Add Ones: 4 + 8 = 12 ➔ Write 2, Carry 1 to Tens

2. Add Tens: 1 (carry) + 3 + 3 = 7 ➔ Write 7

3. Add Hundreds: 5 + 4 = 9 ➔ Write 9

332

+418

750

1. Add Ones: 2 + 8 = 10 ➔ Write 0, Carry 1 to Tens

2. Add Tens: 1 (carry) + 3 + 1 = 5 ➔ Write 5

3. Add Hundreds: 3 + 4 = 7 ➔ Write 7

245

+167

412

1. Add Ones: 5 + 7 = 12 ➔ Write 2, Carry 1 to Tens

2. Add Tens: 1 (carry) + 4 + 6 = 11 ➔ Write 1, Carry 1 to Hundreds

3. Add Hundreds: 1 (carry) + 2 + 1 = 4 ➔ Write 4

332

+118

450

1. Add Ones: 2 + 8 = 10 ➔ Write 0, Carry 1 to Tens

2. Add Tens: 1 (carry) + 3 + 1 = 5 ➔ Write 5

3. Add Hundreds: 3 + 1 = 4 ➔ Write 4

169

+273

442

1. Add Ones: 9 + 3 = 12 ➔ Write 2, Carry 1 to Tens

2. Add Tens: 1 (carry) + 6 + 7 = 14 ➔ Write 4, Carry 1 to Hundreds

3. Add Hundreds: 1 (carry) + 1 + 2 = 4 ➔ Write 4

207

+647

854

1. Add Ones: 7 + 7 = 14 ➔ Write 4, Carry 1 to Tens

2. Add Tens: 1 (carry) + 0 + 4 = 5 ➔ Write 5

3. Add Hundreds: 2 + 6 = 8 ➔ Write 8

534

+207

741

1. Add Ones: 4 + 7 = 11 ➔ Write 1, Carry 1 to Tens

2. Add Tens: 1 (carry) + 3 + 0 = 4 ➔ Write 4

3. Add Hundreds: 5 + 2 = 7 ➔ Write 7

357

+458

815

1. Add Ones: 7 + 8 = 15 ➔ Write 5, Carry 1 to Tens

2. Add Tens: 1 (carry) + 5 + 5 = 11 ➔ Write 1, Carry 1 to Hundreds

3. Add Hundreds: 1 (carry) + 3 + 4 = 8 ➔ Write 8

384

+208

592

1. Add Ones: 4 + 8 = 12 ➔ Write 2, Carry 1 to Tens

2. Add Tens: 1 (carry) + 8 + 0 = 9 ➔ Write 9

3. Add Hundreds: 3 + 2 = 5 ➔ Write 5

436

+219

655

1. Add Ones: 6 + 9 = 15 ➔ Write 5, Carry 1 to Tens

2. Add Tens: 1 (carry) + 3 + 1 = 5 ➔ Write 5

3. Add Hundreds: 4 + 2 = 6 ➔ Write 6

PanMaths.com • Answer Key & Worked SolutionsPage 2 of 2

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Worksheet Info

Categorygrade-2

Grade LevelGrade 2

DifficultyEasy, Medium, Hard, Sprint

Time5-10 min

CCSS CodeCCSS.MATH.CONTENT.2.NBT.B.7

Skills Practiced

✓ 3-Digit Addition With Regrouping

Key Strategies

1️⃣ Add Ones & Regroup: Add the ones column first. If the sum is 10 or greater, write the ones digit in the answer space and write 1 in the carry box above the tens column.
2️⃣ Add Tens (Including Carried 1): Add the tens column, remembering to include the carried 1 from the ones column. If this sum is 10 or greater, write the tens digit and carry 1 to the hundreds box.
3️⃣ Add Hundreds Column: Finally, add the hundreds digits along with any carried 1 from the tens column to complete the total sum.

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📜 Standard: CCSS.MATH.CONTENT.2.NBT.B.7🔗 CCSS.MATH.CONTENT.2.NBT.B.5🔗 CCSS.MATH.CONTENT.2.NBT.B.9

Mastering 3-Digit Addition With Regrouping: Core Concepts & Mental Models

Three-digit addition with regrouping extends place-value composition to the hundreds place. Students systematically add right-to-left: ones, tens, then hundreds, carrying any group of 10 into the next higher place-value column.

Worked Example & SolutionTeacher Step-by-Step Method

📝 Problem: Calculate vertically: 358 + 274

Worked Solution: 1. Ones: 8 + 4 = 12 ➔ Write 2, Carry 1 to Tens. 2. Tens: 1 (carry) + 5 + 7 = 13 ➔ Write 3, Carry 1 to Hundreds. 3. Hundreds: 1 (carry) + 3 + 2 = 6. Total Sum: 632.

💡 Essential Strategies for 3-Digit Addition With Regrouping

1️⃣ Add Ones & Regroup

Add the ones column first. If the sum is 10 or greater, write the ones digit in the answer space and write 1 in the carry box above the tens column.

2️⃣ Add Tens (Including Carried 1)

Add the tens column, remembering to include the carried 1 from the ones column. If this sum is 10 or greater, write the tens digit and carry 1 to the hundreds box.

3️⃣ Add Hundreds Column

Finally, add the hundreds digits along with any carried 1 from the tens column to complete the total sum.

⚠️ Common Mistakes & Teacher Fixes

⚠️Forgetting to add the carried 1 in the hundreds column

Why students stumble: Students remember the ones-to-tens carry but overlook the tens-to-hundreds carry.

Teacher Fix: Check each carry box sequentially: always add the box number first!

Example: In 382 + 254, tens sum is 8 + 5 = 13. Remember to add 1 + 3 + 2 = 6 hundreds, not 5!

⚠️Writing 2 digits in a single column

Why students stumble: Writing 12 directly under the ones column instead of carrying 1 ten.

Teacher Fix: Rule: Only ONE digit per column. If the sum is 10 or more, carry the 1!

Example: For 8 + 7 = 15, write 5 and carry 1 to the tens box.

📖 Key Mathematical Vocabulary

Regrouping / Carrying

Composing 10 ones into 1 ten, or 10 tens into 1 hundred, when a column sum reaches 10 or more.

Place Value Columns

Vertical alignment of digits into Ones, Tens, and Hundreds places.

Carry Box

The small scaffold box above each place value column where carried tens or hundreds are recorded.

Sum

The total result obtained from adding the numbers together.

❓ Frequently Asked Questions

How do you solve a 3-digit addition with regrouping problem step by step?

Here is a worked example: "Calculate vertically: 358 + 274". Solution: 1. Ones: 8 + 4 = 12 ➔ Write 2, Carry 1 to Tens. 2. Tens: 1 (carry) + 5 + 7 = 13 ➔ Write 3, Carry 1 to Hundreds. 3. Hundreds: 1 (carry) + 3 + 2 = 6. Total Sum: 632.

What is the core learning objective for 3-digit addition with regrouping?

Add two three-digit numbers within 1000 using column addition strategies with regrouping (carrying) from ones to tens and/or tens to hundreds. This directly aligns with Common Core Standard CCSS.MATH.CONTENT.2.NBT.B.7.

What is the most common mistake students make with 3-digit addition with regrouping?

A frequent pitfall is: "Forgetting to add the carried 1 in the hundreds column". Why students stumble: Students remember the ones-to-tens carry but overlook the tens-to-hundreds carry. How to fix it: Check each carry box sequentially: always add the box number first! (Example: In 382 + 254, tens sum is 8 + 5 = 13. Remember to add 1 + 3 + 2 = 6 hundreds, not 5!)

How does the unlimited 3-digit addition with regrouping worksheet generator work?

Every click of 'Generate New Worksheet' creates a completely fresh set of 3-digit addition with regrouping problems with unique numbers. No two worksheets are ever the same — perfect for daily practice, homework variety, and preventing student copying. You can also customize the problem count (6, 8, 10, 12, 15, or 20 problems per sheet).

Are these 3-digit addition with regrouping worksheets free to print with answer keys?

Yes! Every single worksheet on PanMaths is 100% free with no sign-up needed. Each sheet includes a dedicated Answer Key on Page 2 with step-by-step intermediate evaluation lines for 1-minute grading.