3rd Grade Addition Math Worksheet with 16 problems for students to solve.

Let’s solve each addition problem step by step. We’ll add the numbers carefully, starting from the right (ones place), then tens, then hundreds — just like you learned in class!

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First row:

1. 124 + 21
- Ones: 4 + 1 = 5
- Tens: 2 + 2 = 4
- Hundreds: 1 + 0 = 1
→ 145

2. 141 + 16
- Ones: 1 + 6 = 7
- Tens: 4 + 1 = 5
- Hundreds: 1 + 0 = 1
→ 157

3. 167 + 26
- Ones: 7 + 6 = 13 → write down 3, carry over 1 to tens
- Tens: 6 + 2 + 1 (carry) = 9
- Hundreds: 1 + 0 = 1
→ 193

4. 174 + 15
- Ones: 4 + 5 = 9
- Tens: 7 + 1 = 8
- Hundreds: 1 + 0 = 1
→ 189

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Second row:

5. 205 + 65
- Ones: 5 + 5 = 10 → write 0, carry 1
- Tens: 0 + 6 + 1 = 7
- Hundreds: 2 + 0 = 2
→ 270

6. 219 + 78
- Ones: 9 + 8 = 17 → write 7, carry 1
- Tens: 1 + 7 + 1 = 9
- Hundreds: 2 + 0 = 2
→ 297

7. 246 + 54
- Ones: 6 + 4 = 10 → write 0, carry 1
- Tens: 4 + 5 + 1 = 10 → write 0, carry 1
- Hundreds: 2 + 0 + 1 = 3
→ 300

8. 439 + 62
- Ones: 9 + 2 = 11 → write 1, carry 1
- Tens: 3 + 6 + 1 = 10 → write 0, carry 1
- Hundreds: 4 + 0 + 1 = 5
→ 501

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Third row:

9. 104 + 103
- Ones: 4 + 3 = 7
- Tens: 0 + 0 = 0
- Hundreds: 1 + 1 = 2
→ 207

10. 146 + 120
- Ones: 6 + 0 = 6
- Tens: 4 + 2 = 6
- Hundreds: 1 + 1 = 2
→ 266

11. 174 + 147
- Ones: 4 + 7 = 11 → write 1, carry 1
- Tens: 7 + 4 + 1 = 12 → write 2, carry 1
- Hundreds: 1 + 1 + 1 = 3
→ 321

12. 136 + 127
- Ones: 6 + 7 = 13 → write 3, carry 1
- Tens: 3 + 2 + 1 = 6
- Hundreds: 1 + 1 = 2
→ 263

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Fourth row:

13. 208 + 193
- Ones: 8 + 3 = 11 → write 1, carry 1
- Tens: 0 + 9 + 1 = 10 → write 0, carry 1
- Hundreds: 2 + 1 + 1 = 4
→ 401

14. 615 + 310
- Ones: 5 + 0 = 5
- Tens: 1 + 1 = 2
- Hundreds: 6 + 3 = 9
→ 925

15. 454 + 342
- Ones: 4 + 2 = 6
- Tens: 5 + 4 = 9
- Hundreds: 4 + 3 = 7
→ 796

16. 626 + 321
- Ones: 6 + 1 = 7
- Tens: 2 + 2 = 4
- Hundreds: 6 + 3 = 9
→ 947

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Final Answer:
145, 157, 193, 189, 270, 297, 300, 501, 207, 266, 321, 263, 401, 925, 796, 947