Printable worksheet for practicing 3-digit addition and subtraction with answers included.

Problem Description:

The image shows a worksheet titled "Adding and Subtracting 3-Digit Numbers". The task involves solving addition and subtraction problems using column addition and subtraction methods. The worksheet provides several problems to solve, and the answers are provided on the right side for verification.

Task:

Solve the given addition and subtraction problems step by step using the column method.

---

Solution:

#### Problem a:
581 + 328

1. Write the numbers in columns:
```
581
+ 328
------
```

2. Add the digits from right to left:
- Units place: \( 1 + 8 = 9 \)
- Tens place: \( 8 + 2 = 10 \) (write 0, carry 1)
- Hundreds place: \( 5 + 3 + 1 (\text{carry}) = 9 \)

3. Final answer:
```
581
+ 328
------
909
```

#### Problem b:
672 - 339

1. Write the numbers in columns:
```
672
- 339
------
```

2. Subtract the digits from right to left:
- Units place: \( 2 < 9 \), so borrow 1 from the tens place. Now, \( 12 - 9 = 3 \).
- Tens place: After borrowing, \( 6 - 1 = 5 \). Now, \( 5 - 3 = 2 \).
- Hundreds place: \( 6 - 3 = 3 \).

3. Final answer:
```
672
- 339
------
333
```

#### Problem c:
760 - 325

1. Write the numbers in columns:
```
760
- 325
------
```

2. Subtract the digits from right to left:
- Units place: \( 0 < 5 \), so borrow 1 from the tens place. Now, \( 10 - 5 = 5 \).
- Tens place: After borrowing, \( 6 - 1 = 5 \). Now, \( 5 - 2 = 3 \).
- Hundreds place: \( 7 - 3 = 4 \).

3. Final answer:
```
760
- 325
------
435
```

#### Problem d:
902 + 378

1. Write the numbers in columns:
```
902
+ 378
------
```

2. Add the digits from right to left:
- Units place: \( 2 + 8 = 10 \) (write 0, carry 1)
- Tens place: \( 0 + 7 + 1 (\text{carry}) = 8 \)
- Hundreds place: \( 9 + 3 = 12 \) (write 2, carry 1)

3. Final answer:
```
902
+ 378
------
1280
```

#### Problem e:
609 - 526

1. Write the numbers in columns:
```
609
- 526
------
```

2. Subtract the digits from right to left:
- Units place: \( 9 - 6 = 3 \)
- Tens place: \( 0 < 2 \), so borrow 1 from the hundreds place. Now, \( 10 - 2 = 8 \).
- Hundreds place: After borrowing, \( 6 - 1 = 5 \). Now, \( 5 - 5 = 0 \).

3. Final answer:
```
609
- 526
------
83
```

#### Problem f:
326 + 419

1. Write the numbers in columns:
```
326
+ 419
------
```

2. Add the digits from right to left:
- Units place: \( 6 + 9 = 15 \) (write 5, carry 1)
- Tens place: \( 2 + 1 + 1 (\text{carry}) = 4 \)
- Hundreds place: \( 3 + 4 = 7 \)

3. Final answer:
```
326
+ 419
------
745
```

#### Problem g:
487 + 133

1. Write the numbers in columns:
```
487
+ 133
------
```

2. Add the digits from right to left:
- Units place: \( 7 + 3 = 10 \) (write 0, carry 1)
- Tens place: \( 8 + 3 + 1 (\text{carry}) = 12 \) (write 2, carry 1)
- Hundreds place: \( 4 + 1 + 1 (\text{carry}) = 6 \)

3. Final answer:
```
487
+ 133
------
620
```

#### Problem h:
569 + 650

1. Write the numbers in columns:
```
569
+ 650
------
```

2. Add the digits from right to left:
- Units place: \( 9 + 0 = 9 \)
- Tens place: \( 6 + 5 = 11 \) (write 1, carry 1)
- Hundreds place: \( 5 + 6 + 1 (\text{carry}) = 12 \) (write 2, carry 1)

3. Final answer:
```
569
+ 650
------
1219
```

#### Problem i:
713 - 286

1. Write the numbers in columns:
```
713
- 286
------
```

2. Subtract the digits from right to left:
- Units place: \( 3 < 6 \), so borrow 1 from the tens place. Now, \( 13 - 6 = 7 \).
- Tens place: After borrowing, \( 1 - 1 = 0 \). Now, \( 0 < 8 \), so borrow 1 from the hundreds place. Now, \( 10 - 8 = 2 \).
- Hundreds place: After borrowing, \( 7 - 1 = 6 \). Now, \( 6 - 2 = 4 \).

3. Final answer:
```
713
- 286
------
427
```

#### Problem j:
317 - 258

1. Write the numbers in columns:
```
317
- 258
------
```

2. Subtract the digits from right to left:
- Units place: \( 7 < 8 \), so borrow 1 from the tens place. Now, \( 17 - 8 = 9 \).
- Tens place: After borrowing, \( 1 - 1 = 0 \). Now, \( 0 < 5 \), so borrow 1 from the hundreds place. Now, \( 10 - 5 = 5 \).
- Hundreds place: After borrowing, \( 3 - 1 = 2 \). Now, \( 2 - 2 = 0 \).

3. Final answer:
```
317
- 258
------
59
```

#### Problem k:
628 + 794

1. Write the numbers in columns:
```
628
+ 794
------
```

2. Add the digits from right to left:
- Units place: \( 8 + 4 = 12 \) (write 2, carry 1)
- Tens place: \( 2 + 9 + 1 (\text{carry}) = 12 \) (write 2, carry 1)
- Hundreds place: \( 6 + 7 + 1 (\text{carry}) = 14 \) (write 4, carry 1)

3. Final answer:
```
628
+ 794
------
1422
```

#### Problem l:
900 - 278

1. Write the numbers in columns:
```
900
- 278
------
```

2. Subtract the digits from right to left:
- Units place: \( 0 < 8 \), so borrow 1 from the tens place. Now, \( 10 - 8 = 2 \).
- Tens place: After borrowing, \( 0 - 1 = -1 \). Now, \( 9 - 7 = 2 \).
- Hundreds place: \( 9 - 2 = 7 \).

3. Final answer:
```
900
- 278
------
622
```

---

Final Answers:

\[
\boxed{
\begin{aligned}
&\text{a. } 909 \\
&\text{b. } 333 \\
&\text{c. } 435 \\
&\text{d. } 1280 \\
&\text{e. } 83 \\
&\text{f. } 745 \\
&\text{g. } 620 \\
&\text{h. } 1219 \\
&\text{i. } 427 \\
&\text{j. } 59 \\
&\text{k. } 1422 \\
&\text{l. } 622 \\
\end{aligned}
}
\]