3-Digit Addition With Regrouping Worksheet for Math Practice

Let’s solve each of the six 3-digit addition problems using the regrouping strategy (also known as “carrying”).

We’ll go one problem at a time, column by column (Ones → Tens → Hundreds), and show regrouping when needed.

---

🔢 Problem 1:

```
2 2 5
+ 1 6 6
---------
```

Step 1: Add Ones place
5 + 6 = 11
→ Write down 1 in the ones place.
→ Regroup 1 ten to the tens column.

Step 2: Add Tens place (including regrouped 1)
2 + 6 + 1 = 9
→ Write down 9 in the tens place.

Step 3: Add Hundreds place
2 + 1 = 3
→ Write down 3 in the hundreds place.

✔ Answer: 391

---

🔢 Problem 2:

```
6 2 7
+ 5 4
---------
```

Wait — this is not aligned correctly! The second number is only 2 digits. We assume it’s meant to be 054 (or 54 with a leading zero in hundreds).

So:
```
6 2 7
+ 0 5 4
---------
```

Step 1: Add Ones place
7 + 4 = 11
→ Write 1, carry 1 to tens.

Step 2: Add Tens place (including regrouped 1)
2 + 5 + 1 = 8
→ Write 8.

Step 3: Add Hundreds place
6 + 0 = 6
→ Write 6.

✔ Answer: 681

*(Note: In the worksheet, the second number is written under the tens and ones columns — so we treat it as 054.)*

---

🔢 Problem 3:

```
7 2 8
+ 8 2
---------
```

Again, misaligned — assume it’s 082.

```
7 2 8
+ 0 8 2
---------
```

Step 1: Ones place
8 + 2 = 10
→ Write 0, carry 1.

Step 2: Tens place (including carry)
2 + 8 + 1 = 11
→ Write 1, carry 1 to hundreds.

Step 3: Hundreds place
7 + 0 + 1 = 8
→ Write 8.

✔ Answer: 810

---

🔢 Problem 4:

```
3 2 9
+ 2 4 6
---------
```

Step 1: Ones place
9 + 6 = 15
→ Write 5, carry 1.

Step 2: Tens place (including carry)
2 + 4 + 1 = 7
→ Write 7.

Step 3: Hundreds place
3 + 2 = 5
→ Write 5.

✔ Answer: 575

---

🔢 Problem 5:

```
4 1 7
+ 1 2 5
---------
```

Step 1: Ones place
7 + 5 = 12
→ Write 2, carry 1.

Step 2: Tens place (including carry)
1 + 2 + 1 = 4
→ Write 4.

Step 3: Hundreds place
4 + 1 = 5
→ Write 5.

✔ Answer: 542

---

🔢 Problem 6:

```
5 0 8
+ 2 4
---------
```

Misaligned again — treat as 024.

```
5 0 8
+ 0 2 4
---------
```

Step 1: Ones place
8 + 4 = 12
→ Write 2, carry 1.

Step 2: Tens place (including carry)
0 + 2 + 1 = 3
→ Write 3.

Step 3: Hundreds place
5 + 0 = 5
→ Write 5.

✔ Answer: 532

---

## ✔ Final Answers for Each Problem:

1. 225 + 166 = 391
2. 627 + 54 = 681 *(treated as 627 + 054)*
3. 728 + 82 = 810 *(treated as 728 + 082)*
4. 329 + 246 = 575
5. 417 + 125 = 542
6. 508 + 24 = 532 *(treated as 508 + 024)*

---

📌 Important Note: Problems 2, 3, and 6 have misaligned addends in the worksheet. In standard math, we align numbers by place value (ones under ones, etc.). So we assumed missing hundreds digits are 0.

If you’re filling out the worksheet, write the answers in the boxes under each problem.

Let me know if you’d like a visual step-by-step for any problem!