Math worksheet for practicing addition of three-digit numbers with regrouping.

Worksheet titled "Adding Three Digit Numbers (with regrouping)" featuring 20 addition problems involving three-digit numbers, with an abacus illustration in the top left corner.

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Show Answer Key & Explanations Step-by-step solution for: Triple Digit Addition No Regroup Worksheet by Teach Simple

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Let's solve each of these three-digit addition problems with regrouping step by step. We'll go through each problem carefully, showing how to add the numbers column by column (ones, tens, hundreds), carrying over when necessary.

---

🔢 Problem 1:

782 + 417

```
782
+ 417
-----
```

- Ones: 2 + 7 = 9 → write 9
- Tens: 8 + 1 = 9 → write 9
- Hundreds: 7 + 4 = 11 → write 1, carry 1

Wait — actually, let's do it properly:

Actually:
- Ones: 2 + 7 = 9
- Tens: 8 + 1 = 9
- Hundreds: 7 + 4 = 11 → write 11

So total: 1199

✔ Answer: 1199

---

🔢 Problem 2:

917 + 138

```
917
+ 138
-----
```

- Ones: 7 + 8 = 15 → write 5, carry 1
- Tens: 1 + 3 + 1 (carry) = 5
- Hundreds: 9 + 1 = 10 → write 10

So: 1055

✔ Answer: 1055

---

🔢 Problem 3:

197 + 517

```
197
+ 517
-----
```

- Ones: 7 + 7 = 14 → write 4, carry 1
- Tens: 9 + 1 + 1 = 11 → write 1, carry 1
- Hundreds: 1 + 5 + 1 = 7

So: 714

✔ Answer: 714

---

🔢 Problem 4:

448 + 667

```
448
+ 667
-----
```

- Ones: 8 + 7 = 15 → write 5, carry 1
- Tens: 4 + 6 + 1 = 11 → write 1, carry 1
- Hundreds: 4 + 6 + 1 = 11 → write 11

So: 1115

✔ Answer: 1115

---

🔢 Problem 5:

776 + 914

```
776
+ 914
-----
```

- Ones: 6 + 4 = 10 → write 0, carry 1
- Tens: 7 + 1 + 1 = 9
- Hundreds: 7 + 9 = 16 → write 16

So: 1690

✔ Answer: 1690

---

🔢 Problem 6:

641 + 558

```
641
+ 558
-----
```

- Ones: 1 + 8 = 9
- Tens: 4 + 5 = 9
- Hundreds: 6 + 5 = 11 → write 11

So: 1199

✔ Answer: 1199

---

🔢 Problem 7:

628 + 681

```
628
+ 681
-----
```

- Ones: 8 + 1 = 9
- Tens: 2 + 8 = 10 → write 0, carry 1
- Hundreds: 6 + 6 + 1 = 13 → write 13

So: 1309

✔ Answer: 1309

---

🔢 Problem 8:

659 + 148

```
659
+ 148
-----
```

- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 5 + 4 + 1 = 10 → write 0, carry 1
- Hundreds: 6 + 1 + 1 = 8

So: 807

✔ Answer: 807

---

🔢 Problem 9:

109 + 788

```
109
+ 788
-----
```

- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 0 + 8 + 1 = 9
- Hundreds: 1 + 7 = 8

So: 897

✔ Answer: 897

---

🔢 Problem 10:

458 + 775

```
458
+ 775
-----
```

- Ones: 8 + 5 = 13 → write 3, carry 1
- Tens: 5 + 7 + 1 = 13 → write 3, carry 1
- Hundreds: 4 + 7 + 1 = 12 → write 12

So: 1233

✔ Answer: 1233

---

🔢 Problem 11:

194 + 388

```
194
+ 388
-----
```

- Ones: 4 + 8 = 12 → write 2, carry 1
- Tens: 9 + 8 + 1 = 18 → write 8, carry 1
- Hundreds: 1 + 3 + 1 = 5

So: 582

✔ Answer: 582

---

🔢 Problem 12:

958 + 717

```
958
+ 717
-----
```

- Ones: 8 + 7 = 15 → write 5, carry 1
- Tens: 5 + 1 + 1 = 7
- Hundreds: 9 + 7 = 16 → write 16

So: 1675

✔ Answer: 1675

---

🔢 Problem 13:

229 + 518

```
229
+ 518
-----
```

- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 2 + 1 + 1 = 4
- Hundreds: 2 + 5 = 7

So: 747

✔ Answer: 747

---

🔢 Problem 14:

579 + 555

```
579
+ 555
-----
```

- Ones: 9 + 5 = 14 → write 4, carry 1
- Tens: 7 + 5 + 1 = 13 → write 3, carry 1
- Hundreds: 5 + 5 + 1 = 11 → write 11

So: 1134

✔ Answer: 1134

---

🔢 Problem 15:

277 + 377

```
277
+ 377
-----
```

- Ones: 7 + 7 = 14 → write 4, carry 1
- Tens: 7 + 7 + 1 = 15 → write 5, carry 1
- Hundreds: 2 + 3 + 1 = 6

So: 654

✔ Answer: 654

---

🔢 Problem 16:

471 + 519

```
471
+ 519
-----
```

- Ones: 1 + 9 = 10 → write 0, carry 1
- Tens: 7 + 1 + 1 = 9
- Hundreds: 4 + 5 = 9

So: 990

✔ Answer: 990

---

🔢 Problem 17:

882 + 418

```
882
+ 418
-----
```

- Ones: 2 + 8 = 10 → write 0, carry 1
- Tens: 8 + 1 + 1 = 10 → write 0, carry 1
- Hundreds: 8 + 4 + 1 = 13 → write 13

So: 1300

✔ Answer: 1300

---

🔢 Problem 18:

881 + 617

```
881
+ 617
-----
```

- Ones: 1 + 7 = 8
- Tens: 8 + 1 = 9
- Hundreds: 8 + 6 = 14 → write 14

So: 1498

✔ Answer: 1498

---

🔢 Problem 19:

819 + 653

```
819
+ 653
-----
```

- Ones: 9 + 3 = 12 → write 2, carry 1
- Tens: 1 + 5 + 1 = 7
- Hundreds: 8 + 6 = 14 → write 14

So: 1472

✔ Answer: 1472

---

🔢 Problem 20:

991 + 433

```
991
+ 433
-----
```

- Ones: 1 + 3 = 4
- Tens: 9 + 3 = 12 → write 2, carry 1
- Hundreds: 9 + 4 + 1 = 14 → write 14

So: 1424

✔ Answer: 1424

---

## ✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 1 | 1199 |
| 2 | 1055 |
| 3 | 714 |
| 4 | 1115 |
| 5 | 1690 |
| 6 | 1199 |
| 7 | 1309 |
| 8 | 807 |
| 9 | 897 |
| 10 | 1233 |
| 11 | 582 |
| 12 | 1675 |
| 13 | 747 |
| 14 | 1134 |
| 15 | 654 |
| 16 | 990 |
| 17 | 1300 |
| 18 | 1498 |
| 19 | 1472 |
| 20 | 1424 |

---

📝 Summary:

All problems involve adding two three-digit numbers, often requiring regrouping (carrying) in one or more columns. The key steps are:

1. Add ones column first.
2. If sum ≥ 10, carry over to tens.
3. Add tens, including any carry.
4. Add hundreds, including any carry.
5. Write final answer.

This practice helps build strong foundational arithmetic skills.

Let me know if you'd like a printable version or a worksheet with explanations!

Parent Tip: Review the logic above to help your child master the concept of 3 digit addition without regrouping worksheet.

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