Adding Whole Numbers Grade 6 Worksheet - Free Printable

Let's solve each of these addition problems step by step. We'll add the numbers column by column, starting from the rightmost digit (ones place) and moving to the left, carrying over when necessary.

---

1. 27,234 + 95,201

```
27,234
+ 95,201
--------
122,435
```

Explanation:
- 4 + 1 = 5
- 3 + 0 = 3
- 2 + 2 = 4
- 7 + 5 = 12 → write 2, carry 1
- 2 + 9 + 1 = 12 → write 2, carry 1
→ Final sum: 122,435

---

2. 640,291 + 878,141

```
640,291
+ 878,141
---------
1,518,432
```

Explanation:
- 1 + 1 = 2
- 9 + 4 = 13 → write 3, carry 1
- 2 + 1 + 1 = 4
- 0 + 8 = 8
- 4 + 7 = 11 → write 1, carry 1
- 6 + 8 + 1 = 15 → write 5, carry 1
→ Add the carried 1 → 1,518,432

---

3. 952,575 + 83,392

```
952,575
+ 83,392
---------
1,035,967
```

Explanation:
- 5 + 2 = 7
- 7 + 9 = 16 → write 6, carry 1
- 5 + 3 + 1 = 9
- 2 + 8 = 10 → write 0, carry 1
- 5 + 3 + 1 = 9
- 9 + 0 = 9
→ 1,035,967

---

4. 528,593 + 96,177

```
528,593
+ 96,177
---------
624,770
```

Explanation:
- 3 + 7 = 10 → write 0, carry 1
- 9 + 7 + 1 = 17 → write 7, carry 1
- 5 + 1 + 1 = 7
- 8 + 6 = 14 → write 4, carry 1
- 2 + 9 + 1 = 12 → write 2, carry 1
- 5 + 0 + 1 = 6
→ 624,770

---

5. 620,996 + 812,712

```
620,996
+ 812,712
---------
1,433,708
```

Explanation:
- 6 + 2 = 8
- 9 + 1 = 10 → write 0, carry 1
- 9 + 7 + 1 = 17 → write 7, carry 1
- 0 + 2 + 1 = 3
- 2 + 1 = 3
- 6 + 8 = 14 → write 4, carry 1
→ Add carried 1 → 1,433,708

---

6. 888,435 + 102,850

```
888,435
+ 102,850
---------
991,285
```

Explanation:
- 5 + 0 = 5
- 3 + 5 = 8
- 4 + 8 = 12 → write 2, carry 1
- 8 + 2 + 1 = 11 → write 1, carry 1
- 8 + 0 + 1 = 9
- 8 + 1 = 9
→ 991,285

---

7. 581,354 + 158,414

```
581,354
+ 158,414
---------
739,768
```

Explanation:
- 4 + 4 = 8
- 5 + 1 = 6
- 3 + 4 = 7
- 1 + 8 = 9
- 8 + 5 = 13 → write 3, carry 1
- 5 + 1 + 1 = 7
→ 739,768

---

8. 191,191 + 607,475

```
191,191
+ 607,475
---------
798,666
```

Explanation:
- 1 + 5 = 6
- 9 + 7 = 16 → write 6, carry 1
- 1 + 4 + 1 = 6
- 1 + 7 = 8
- 9 + 0 = 9
- 1 + 6 = 7
→ 798,666

---

9. 487,693 + 180,034

```
487,693
+ 180,034
---------
667,727
```

Explanation:
- 3 + 4 = 7
- 9 + 3 = 12 → write 2, carry 1
- 6 + 0 + 1 = 7
- 7 + 0 = 7
- 8 + 8 = 16 → write 6, carry 1
- 4 + 1 + 1 = 6
→ 667,727

---

10. 273,119 + 205,411

```
273,119
+ 205,411
---------
478,530
```

Explanation:
- 9 + 1 = 10 → write 0, carry 1
- 1 + 1 + 1 = 3
- 1 + 4 = 5
- 3 + 5 = 8
- 7 + 0 = 7
- 2 + 2 = 4
→ 478,530

---

11. 964,562 + 974,966

```
964,562
+ 974,966
---------
1,939,528
```

Explanation:
- 2 + 6 = 8
- 6 + 6 = 12 → write 2, carry 1
- 5 + 9 + 1 = 15 → write 5, carry 1
- 4 + 4 + 1 = 9
- 6 + 7 = 13 → write 3, carry 1
- 9 + 9 + 1 = 19 → write 9, carry 1
→ Add carried 1 → 1,939,528

---

12. 838,095 + 30,477

```
838,095
+ 30,477
---------
868,572
```

Explanation:
- 5 + 7 = 12 → write 2, carry 1
- 9 + 7 + 1 = 17 → write 7, carry 1
- 0 + 4 + 1 = 5
- 8 + 0 = 8
- 3 + 3 = 6
- 8 + 0 = 8
→ 868,572

---

✔ Final Answers:

1. 122,435
2. 1,518,432
3. 1,035,967
4. 624,770
5. 1,433,708
6. 991,285
7. 739,768
8. 798,666
9. 667,727
10. 478,530
11. 1,939,528
12. 868,572

Let me know if you'd like this formatted as a printable answer key!