Grade 3 addition worksheet with nine three-digit addition problems, designed for practice and learning.

Let's solve each addition problem step by step. We'll add the numbers column by column, starting from the right (ones place), and carry over if necessary.

---

1. 724 + 547 + 597

```
724
547
+ 597
------
```

Step-by-step:

- Ones: 4 + 7 + 7 = 18 → write down 8, carry over 1
- Tens: 2 + 4 + 9 + 1 (carry) = 16 → write down 6, carry over 1
- Hundreds: 7 + 5 + 5 + 1 (carry) = 18

So, the sum is 1868

---

2. 453 + 234 + 654

```
453
234
+ 654
------
```

- Ones: 3 + 4 + 4 = 11 → write 1, carry 1
- Tens: 5 + 3 + 5 + 1 = 14 → write 4, carry 1
- Hundreds: 4 + 2 + 6 + 1 = 13

Sum: 1341

---

3. 768 + 879 + 657

```
768
879
+ 657
------
```

- Ones: 8 + 9 + 7 = 24 → write 4, carry 2
- Tens: 6 + 7 + 5 + 2 = 20 → write 0, carry 2
- Hundreds: 7 + 8 + 6 + 2 = 23

Sum: 2304

---

4. 945 + 454 + 334

```
945
454
+ 334
------
```

- Ones: 5 + 4 + 4 = 13 → write 3, carry 1
- Tens: 4 + 5 + 3 + 1 = 13 → write 3, carry 1
- Hundreds: 9 + 4 + 3 + 1 = 17

Sum: 1733

---

5. 456 + 878 + 567

```
456
878
+ 567
------
```

- Ones: 6 + 8 + 7 = 21 → write 1, carry 2
- Tens: 5 + 7 + 6 + 2 = 20 → write 0, carry 2
- Hundreds: 4 + 8 + 5 + 2 = 19

Sum: 1901

---

6. 234 + 432 + 546

```
234
432
+ 546
------
```

- Ones: 4 + 2 + 6 = 12 → write 2, carry 1
- Tens: 3 + 3 + 4 + 1 = 11 → write 1, carry 1
- Hundreds: 2 + 4 + 5 + 1 = 12

Sum: 1212

---

7. 327 + 358 + 893

```
327
358
+ 893
------
```

- Ones: 7 + 8 + 3 = 18 → write 8, carry 1
- Tens: 2 + 5 + 9 + 1 = 17 → write 7, carry 1
- Hundreds: 3 + 3 + 8 + 1 = 15

Sum: 1578

---

8. 569 + 121 + 871

```
569
121
+ 871
------
```

- Ones: 9 + 1 + 1 = 11 → write 1, carry 1
- Tens: 6 + 2 + 7 + 1 = 16 → write 6, carry 1
- Hundreds: 5 + 1 + 8 + 1 = 15

Sum: 1561

---

9. 987 + 345 + 234

```
987
345
+ 234
------
```

- Ones: 7 + 5 + 4 = 16 → write 6, carry 1
- Tens: 8 + 4 + 3 + 1 = 16 → write 6, carry 1
- Hundreds: 9 + 3 + 2 + 1 = 15

Sum: 1566

---

✔ Final Answers:

1. 1868
2. 1341
3. 2304
4. 1733
5. 1901
6. 1212
7. 1578
8. 1561
9. 1566

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Let me know if you'd like a printable version or explanation for any specific problem!