Math practice worksheet with addition, subtraction, and multiplication exercises.

Problem Description:

The image contains three sections: Addition, Subtraction, and Multiplication. Each section has a set of problems that need to be solved. Let's solve each problem step by step.

---

Section 1: Addition

#### Problem 1: \( 996 + 978 \)
1. Align the numbers by place value:
```
996
+ 978
------
```
2. Add the digits from right to left:
- Ones place: \( 6 + 8 = 14 \) → Write down 4, carry over 1.
- Tens place: \( 9 + 7 + 1 = 17 \) → Write down 7, carry over 1.
- Hundreds place: \( 9 + 9 + 1 = 19 \) → Write down 9, carry over 1.
- Thousands place: \( 0 + 0 + 1 = 1 \).

Final result: \( 1974 \).

#### Problem 2: \( 896 + 968 \)
1. Align the numbers by place value:
```
896
+ 968
------
```
2. Add the digits from right to left:
- Ones place: \( 6 + 8 = 14 \) → Write down 4, carry over 1.
- Tens place: \( 9 + 6 + 1 = 16 \) → Write down 6, carry over 1.
- Hundreds place: \( 8 + 9 + 1 = 18 \) → Write down 8, carry over 1.
- Thousands place: \( 0 + 0 + 1 = 1 \).

Final result: \( 1864 \).

#### Problem 3: \( 795 + 998 \)
1. Align the numbers by place value:
```
795
+ 998
------
```
2. Add the digits from right to left:
- Ones place: \( 5 + 8 = 13 \) → Write down 3, carry over 1.
- Tens place: \( 9 + 9 + 1 = 19 \) → Write down 9, carry over 1.
- Hundreds place: \( 7 + 9 + 1 = 17 \) → Write down 7, carry over 1.
- Thousands place: \( 0 + 0 + 1 = 1 \).

Final result: \( 1793 \).

---

Section 2: Subtraction

#### Problem 1: \( 926 - 658 \)
1. Align the numbers by place value:
```
926
- 658
------
```
2. Subtract the digits from right to left:
- Ones place: \( 6 - 8 \). Borrow 1 from the tens place (2 becomes 1, 6 becomes 16).
\( 16 - 8 = 8 \).
- Tens place: \( 1 - 5 \). Borrow 1 from the hundreds place (9 becomes 8, 1 becomes 11).
\( 11 - 5 = 6 \).
- Hundreds place: \( 8 - 6 = 2 \).

Final result: \( 268 \).

#### Problem 2: \( 835 - 368 \)
1. Align the numbers by place value:
```
835
- 368
------
```
2. Subtract the digits from right to left:
- Ones place: \( 5 - 8 \). Borrow 1 from the tens place (3 becomes 2, 5 becomes 15).
\( 15 - 8 = 7 \).
- Tens place: \( 2 - 6 \). Borrow 1 from the hundreds place (8 becomes 7, 2 becomes 12).
\( 12 - 6 = 6 \).
- Hundreds place: \( 7 - 3 = 4 \).

Final result: \( 467 \).

#### Problem 3: \( 956 - 598 \)
1. Align the numbers by place value:
```
956
- 598
------
```
2. Subtract the digits from right to left:
- Ones place: \( 6 - 8 \). Borrow 1 from the tens place (5 becomes 4, 6 becomes 16).
\( 16 - 8 = 8 \).
- Tens place: \( 4 - 9 \). Borrow 1 from the hundreds place (9 becomes 8, 4 becomes 14).
\( 14 - 9 = 5 \).
- Hundreds place: \( 8 - 5 = 3 \).

Final result: \( 358 \).

---

Section 3: Multiplication

#### Problem 1: \( 21 \times 2 \)
1. Multiply each digit of 21 by 2:
- \( 1 \times 2 = 2 \)
- \( 2 \times 2 = 4 \)

Final result: \( 42 \).

#### Problem 2: \( 42 \times 2 \)
1. Multiply each digit of 42 by 2:
- \( 2 \times 2 = 4 \)
- \( 4 \times 2 = 8 \)

Final result: \( 84 \).

#### Problem 3: \( 53 \times 2 \)
1. Multiply each digit of 53 by 2:
- \( 3 \times 2 = 6 \)
- \( 5 \times 2 = 10 \) (write down 0, carry over 1).
- Add the carry-over to the next place: \( 1 + 0 = 1 \).

Final result: \( 106 \).

#### Problem 4: \( 84 \times 2 \)
1. Multiply each digit of 84 by 2:
- \( 4 \times 2 = 8 \)
- \( 8 \times 2 = 16 \) (write down 6, carry over 1).
- Add the carry-over to the next place: \( 1 + 0 = 1 \).

Final result: \( 168 \).

---

Final Answers:

- Addition:
- \( 996 + 978 = 1974 \)
- \( 896 + 968 = 1864 \)
- \( 795 + 998 = 1793 \)

- Subtraction:
- \( 926 - 658 = 268 \)
- \( 835 - 368 = 467 \)
- \( 956 - 598 = 358 \)

- Multiplication:
- \( 21 \times 2 = 42 \)
- \( 42 \times 2 = 84 \)
- \( 53 \times 2 = 106 \)
- \( 84 \times 2 = 168 \)

Boxed Final Answer:

\[
\boxed{
\begin{aligned}
&\text{Addition: } 1974, 1864, 1793 \\
&\text{Subtraction: } 268, 467, 358 \\
&\text{Multiplication: } 42, 84, 106, 168
\end{aligned}
}
\]