3rd Grade Math Worksheets | Math Pyramid - Free Printable

$3rd Grade Math Worksheets | Math Pyramid$

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Show Answer Key & Explanations Step-by-step solution for: 3rd Grade Math Worksheets | Math Pyramid

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Let's solve each of the addition problems on the worksheet step by step. I'll go through them one at a time, showing the addition process and providing the final answer.

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1. 478 + 347

```
478
+347
-----
825
```
Explanation:
- 8 + 7 = 15 → write down 5, carry over 1
- 7 + 4 + 1 (carry) = 12 → write down 2, carry over 1
- 4 + 3 + 1 = 8
→ Answer: 825

---

2. 706 + 999

```
706
+999
-----
1705
```
Explanation:
- 6 + 9 = 15 → write down 5, carry over 1
- 0 + 9 + 1 = 10 → write down 0, carry over 1
- 7 + 9 + 1 = 17 → write down 7, carry over 1
→ Answer: 1705

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3. 231 + 239

```
231
+239
-----
470
```
Explanation:
- 1 + 9 = 10 → write down 0, carry over 1
- 3 + 3 + 1 = 7
- 2 + 2 = 4
→ Answer: 470

---

4. 568 + 103

```
568
+103
-----
671
```
Explanation:
- 8 + 3 = 11 → write down 1, carry over 1
- 6 + 0 + 1 = 7
- 5 + 1 = 6
→ Answer: 671

---

5. 349 + 109

```
349
+109
-----
458
```
Explanation:
- 9 + 9 = 18 → write down 8, carry over 1
- 4 + 0 + 1 = 5
- 3 + 1 = 4
→ Answer: 458

---

6. 498 + 123

```
498
+123
-----
621
```
Explanation:
- 8 + 3 = 11 → write down 1, carry over 1
- 9 + 2 + 1 = 12 → write down 2, carry over 1
- 4 + 1 + 1 = 6
→ Answer: 621

---

7. 780 + 129

```
780
+129
-----
909
```
Explanation:
- 0 + 9 = 9
- 8 + 2 = 10 → write down 0, carry over 1
- 7 + 1 + 1 = 9
→ Answer: 909

---

8. 494 + 555

```
494
+555
-----
1049
```
Explanation:
- 4 + 5 = 9
- 9 + 5 = 14 → write down 4, carry over 1
- 4 + 5 + 1 = 10 → write down 0, carry over 1
→ Answer: 1049

---

9. 375 + 197

```
375
+197
-----
572
```
Explanation:
- 5 + 7 = 12 → write down 2, carry over 1
- 7 + 9 + 1 = 17 → write down 7, carry over 1
- 3 + 1 + 1 = 5
→ Answer: 572

---

10. 800 + 211

```
800
+211
-----
1011
```
Explanation:
- 0 + 1 = 1
- 0 + 1 = 1
- 8 + 2 = 10
→ Answer: 1011

---

11. 913 + 418

```
913
+418
-----
1331
```
Explanation:
- 3 + 8 = 11 → write down 1, carry over 1
- 1 + 1 + 1 = 3
- 9 + 4 = 13 → write down 3, carry over 1
→ Answer: 1331

---

12. 419 + 233

```
419
+233
-----
652
```
Explanation:
- 9 + 3 = 12 → write down 2, carry over 1
- 1 + 3 + 1 = 5
- 4 + 2 = 6
→ Answer: 652

---

13. 789 + 854

```
789
+854
-----
1643
```
Explanation:
- 9 + 4 = 13 → write down 3, carry over 1
- 8 + 5 + 1 = 14 → write down 4, carry over 1
- 7 + 8 + 1 = 16 → write down 6, carry over 1
→ Answer: 1643

---

14. 679 + 111

```
679
+111
-----
790
```
Explanation:
- 9 + 1 = 10 → write down 0, carry over 1
- 7 + 1 + 1 = 9
- 6 + 1 = 7
→ Answer: 790

---

15. 348 + 267

```
348
+267
-----
615
```
Explanation:
- 8 + 7 = 15 → write down 5, carry over 1
- 4 + 6 + 1 = 11 → write down 1, carry over 1
- 3 + 2 + 1 = 6
→ Answer: 615

---

16. 812 + 937

```
812
+937
-----
1749
```
Explanation:
- 2 + 7 = 9
- 1 + 3 = 4
- 8 + 9 = 17 → write down 7, carry over 1
→ Answer: 1749

---

17. 872 + 931

```
872
+931
-----
1803
```
Explanation:
- 2 + 1 = 3
- 7 + 3 = 10 → write down 0, carry over 1
- 8 + 9 + 1 = 18 → write down 8, carry over 1
→ Answer: 1803

---

18. 499 + 225

```
499
+225
-----
724
```
Explanation:
- 9 + 5 = 14 → write down 4, carry over 1
- 9 + 2 + 1 = 12 → write down 2, carry over 1
- 4 + 2 + 1 = 7
→ Answer: 724

---

✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 478 + 347 | 825 |
| 706 + 999 | 1705 |
| 231 + 239 | 470 |
| 568 + 103 | 671 |
| 349 + 109 | 458 |
| 498 + 123 | 621 |
| 780 + 129 | 909 |
| 494 + 555 | 1049 |
| 375 + 197 | 572 |
| 800 + 211 | 1011 |
| 913 + 418 | 1331 |
| 419 + 233 | 652 |
| 789 + 854 | 1643 |
| 679 + 111 | 790 |
| 348 + 267 | 615 |
| 812 + 937 | 1749 |
| 872 + 931 | 1803 |
| 499 + 225 | 724 |

✔ All problems solved correctly! Let me know if you'd like this formatted as a printable answer sheet.

Parent Tip: Review the logic above to help your child master the concept of free printable 3rd grade math worksheets.

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