Add 3-digit and 2-digit numbers with regrouping - a math worksheet for practice.

I'll solve each addition problem step by step, working through the regrouping carefully.

Let me work through all 16 problems:

Problem 1: 23 + 138
- Ones place: 3 + 8 = 11 (write 1, carry 1)
- Tens place: 2 + 3 + 1 = 6
- Hundreds place: 0 + 1 = 1
- Answer: 161

Problem 2: 55 + 215
- Ones place: 5 + 5 = 10 (write 0, carry 1)
- Tens place: 5 + 1 + 1 = 7
- Hundreds place: 0 + 2 = 2
- Answer: 270

Problem 3: 15 + 329
- Ones place: 5 + 9 = 14 (write 4, carry 1)
- Tens place: 1 + 2 + 1 = 4
- Hundreds place: 0 + 3 = 3
- Answer: 344

Problem 4: 717 + 14
- Ones place: 7 + 4 = 11 (write 1, carry 1)
- Tens place: 1 + 1 + 1 = 3
- Hundreds place: 7 + 0 = 7
- Answer: 731

Problem 5: 63 + 765
- Ones place: 3 + 5 = 8
- Tens place: 6 + 6 = 12 (write 2, carry 1)
- Hundreds place: 0 + 7 + 1 = 8
- Answer: 828

Problem 6: 217 + 85
- Ones place: 7 + 5 = 12 (write 2, carry 1)
- Tens place: 1 + 8 + 1 = 10 (write 0, carry 1)
- Hundreds place: 2 + 0 + 1 = 3
- Answer: 302

Problem 7: 414 + 58
- Ones place: 4 + 8 = 12 (write 2, carry 1)
- Tens place: 1 + 5 + 1 = 7
- Hundreds place: 4 + 0 = 4
- Answer: 472

Problem 8: 75 + 194
- Ones place: 5 + 4 = 9
- Tens place: 7 + 9 = 16 (write 6, carry 1)
- Hundreds place: 0 + 1 + 1 = 2
- Answer: 269

Problem 9: 786 + 23
- Ones place: 6 + 3 = 9
- Tens place: 8 + 2 = 10 (write 0, carry 1)
- Hundreds place: 7 + 0 + 1 = 8
- Answer: 809

Problem 10: 791 + 54
- Ones place: 1 + 4 = 5
- Tens place: 9 + 5 = 14 (write 4, carry 1)
- Hundreds place: 7 + 0 + 1 = 8
- Answer: 845

Problem 11: 84 + 792
- Ones place: 4 + 2 = 6
- Tens place: 8 + 9 = 17 (write 7, carry 1)
- Hundreds place: 0 + 7 + 1 = 8
- Answer: 876

Problem 12: 572 + 36
- Ones place: 2 + 6 = 8
- Tens place: 7 + 3 = 10 (write 0, carry 1)
- Hundreds place: 5 + 0 + 1 = 6
- Answer: 608

Problem 13: 598 + 26
- Ones place: 8 + 6 = 14 (write 4, carry 1)
- Tens place: 9 + 2 + 1 = 12 (write 2, carry 1)
- Hundreds place: 5 + 0 + 1 = 6
- Answer: 624

Problem 14: 199 + 64
- Ones place: 9 + 4 = 13 (write 3, carry 1)
- Tens place: 9 + 6 + 1 = 16 (write 6, carry 1)
- Hundreds place: 1 + 0 + 1 = 2
- Answer: 263

Problem 15: 129 + 78
- Ones place: 9 + 8 = 17 (write 7, carry 1)
- Tens place: 2 + 7 + 1 = 10 (write 0, carry 1)
- Hundreds place: 1 + 0 + 1 = 2
- Answer: 207

Problem 16: 55 + 769
- Ones place: 5 + 9 = 14 (write 4, carry 1)
- Tens place: 5 + 6 + 1 = 12 (write 2, carry 1)
- Hundreds place: 0 + 7 + 1 = 8
- Answer: 824

Let me verify a few of these calculations to make sure they're correct: