Grade 3 Addition Worksheet: Adding Three 4-Digit Numbers in Columns

Let's solve each of the 12 addition problems step by step. We are adding three 4-digit numbers in columns, so we will add them vertically, starting from the rightmost digit (ones place) and moving left, carrying over when necessary.

---

Problem 1:

```
1,564
801
+ 6,921
-------
```

Step-by-step:

- Ones: 4 + 1 + 1 = 6
- Tens: 6 + 0 + 2 = 8
- Hundreds: 5 + 8 + 9 = 22 → write 2, carry 2
- Thousands: 1 + 0 + 6 + 2 (carry) = 9

Answer: 9,286

---

Problem 2:

```
2,620
6,884
+ 9,277
-------
```

- Ones: 0 + 4 + 7 = 11 → write 1, carry 1
- Tens: 2 + 8 + 7 + 1 = 18 → write 8, carry 1
- Hundreds: 6 + 8 + 2 + 1 = 17 → write 7, carry 1
- Thousands: 2 + 6 + 9 + 1 = 18

Answer: 18,781

---

Problem 3:

```
4,085
3,362
+ 4,383
-------
```

- Ones: 5 + 2 + 3 = 10 → write 0, carry 1
- Tens: 8 + 6 + 8 + 1 = 23 → write 3, carry 2
- Hundreds: 0 + 3 + 3 + 2 = 8
- Thousands: 4 + 3 + 4 = 11

Answer: 11,830

---

Problem 4:

```
1,472
7,740
+ 5,911
-------
```

- Ones: 2 + 0 + 1 = 3
- Tens: 7 + 4 + 1 = 12 → write 2, carry 1
- Hundreds: 4 + 7 + 9 + 1 = 21 → write 1, carry 2
- Thousands: 1 + 7 + 5 + 2 = 15

Answer: 15,123

---

Problem 5:

```
1,825
4,816
+ 3,116
-------
```

- Ones: 5 + 6 + 6 = 17 → write 7, carry 1
- Tens: 2 + 1 + 1 + 1 = 5
- Hundreds: 8 + 8 + 1 = 17 → write 7, carry 1
- Thousands: 1 + 4 + 3 + 1 = 9

Answer: 9,757

---

Problem 6:

```
445
2,365
+ 8,373
-------
```

- Ones: 5 + 5 + 3 = 13 → write 3, carry 1
- Tens: 4 + 6 + 7 + 1 = 18 → write 8, carry 1
- Hundreds: 4 + 3 + 3 + 1 = 11 → write 1, carry 1
- Thousands: 0 + 2 + 8 + 1 = 11

Answer: 11,183

---

Problem 7:

```
7,223
6,922
+ 635
-------
```

- Ones: 3 + 2 + 5 = 10 → write 0, carry 1
- Tens: 2 + 2 + 3 + 1 = 8
- Hundreds: 2 + 9 + 6 = 17 → write 7, carry 1
- Thousands: 7 + 6 + 0 + 1 = 14

Answer: 14,780

---

Problem 8:

```
1,503
6,216
+ 4,977
-------
```

- Ones: 3 + 6 + 7 = 16 → write 6, carry 1
- Tens: 0 + 1 + 7 + 1 = 9
- Hundreds: 5 + 2 + 9 = 16 → write 6, carry 1
- Thousands: 1 + 6 + 4 + 1 = 12

Answer: 12,696

---

Problem 9:

```
4,608
5,412
+ 2,973
-------
```

- Ones: 8 + 2 + 3 = 13 → write 3, carry 1
- Tens: 0 + 1 + 7 + 1 = 9
- Hundreds: 6 + 4 + 9 = 19 → write 9, carry 1
- Thousands: 4 + 5 + 2 + 1 = 12

Answer: 12,993

---

Problem 10:

```
3,780
5,226
+ 4,726
-------
```

- Ones: 0 + 6 + 6 = 12 → write 2, carry 1
- Tens: 8 + 2 + 2 + 1 = 13 → write 3, carry 1
- Hundreds: 7 + 2 + 7 + 1 = 17 → write 7, carry 1
- Thousands: 3 + 5 + 4 + 1 = 13

Answer: 13,732

---

Problem 11:

```
5,429
3,896
+ 6,551
-------
```

- Ones: 9 + 6 + 1 = 16 → write 6, carry 1
- Tens: 2 + 9 + 5 + 1 = 17 → write 7, carry 1
- Hundreds: 4 + 8 + 5 + 1 = 18 → write 8, carry 1
- Thousands: 5 + 3 + 6 + 1 = 15

Answer: 15,876

---

Problem 12:

```
9,455
4,344
+ 1,586
-------
```

- Ones: 5 + 4 + 6 = 15 → write 5, carry 1
- Tens: 5 + 4 + 8 + 1 = 18 → write 8, carry 1
- Hundreds: 4 + 3 + 5 + 1 = 13 → write 3, carry 1
- Thousands: 9 + 4 + 1 + 1 = 15

Answer: 15,385

---

✔ Final Answers:

1. 9,286
2. 18,781
3. 11,830
4. 15,123
5. 9,757
6. 11,183
7. 14,780
8. 12,696
9. 12,993
10. 13,732
11. 15,876
12. 15,385

---

🔍 Explanation:

To add three 4-digit numbers in columns:
- Align the numbers by place value (ones, tens, hundreds, thousands).
- Add each column from right to left.
- Carry over any amount greater than 9 to the next higher place value.
- Be careful with multiple carries, especially in the hundreds and thousands places.

This method ensures accuracy and builds strong foundational arithmetic skills for Grade 3 students.

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