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

Let's solve each of the arithmetic problems step by step.

---

Addition

#### 1. $ 996 + 978 $

```
996
+ 978
-----
```

- Units: $6 + 8 = 14$ → write down 4, carry over 1
- Tens: $9 + 7 = 16$, plus carry-over 1 = 17 → write down 7, carry over 1
- Hundreds: $9 + 9 = 18$, plus carry-over 1 = 19

So, $996 + 978 = \boxed{1974}$

---

#### 2. $ 896 + 968 $

```
896
+ 968
-----
```

- Units: $6 + 8 = 14$ → write 4, carry 1
- Tens: $9 + 6 = 15$, plus 1 = 16 → write 6, carry 1
- Hundreds: $8 + 9 = 17$, plus 1 = 18

So, $896 + 968 = \boxed{1864}$

---

#### 3. $ 795 + 998 $

```
795
+ 998
-----
```

- Units: $5 + 8 = 13$ → write 3, carry 1
- Tens: $9 + 9 = 18$, plus 1 = 19 → write 9, carry 1
- Hundreds: $7 + 9 = 16$, plus 1 = 17

So, $795 + 998 = \boxed{1793}$

---

Subtraction

#### 1. $ 926 - 658 $

```
926
- 658
-----
```

- Units: $6 - 8$ → can't do, borrow from tens
- Tens digit is 2 → becomes 1, units become 16
- $16 - 8 = 8$
- Tens: Now $1 - 5$ → can't do, borrow from hundreds
- Hundreds digit 9 → becomes 8, tens become 11
- $11 - 5 = 6$
- Hundreds: $8 - 6 = 2$

So, $926 - 658 = \boxed{268}$

---

#### 2. $ 835 - 368 $

```
835
- 368
-----
```

- Units: $5 - 8$ → borrow
- Tens: 3 → becomes 2, units: 15
- $15 - 8 = 7$
- Tens: $2 - 6$ → borrow
- Hundreds: 8 → becomes 7, tens: 12
- $12 - 6 = 6$
- Hundreds: $7 - 3 = 4$

So, $835 - 368 = \boxed{467}$

---

#### 3. $ 956 - 598 $

```
956
- 598
-----
```

- Units: $6 - 8$ → borrow
- Tens: 5 → becomes 4, units: 16
- $16 - 8 = 8$
- Tens: $4 - 9$ → borrow
- Hundreds: 9 → becomes 8, tens: 14
- $14 - 9 = 5$
- Hundreds: $8 - 5 = 3$

So, $956 - 598 = \boxed{358}$

---

Multiplication

All are multiplying by 2:

#### 1. $ 21 × 2 $

$$
21 × 2 = (20 + 1) × 2 = 40 + 2 = \boxed{42}
$$

#### 2. $ 42 × 2 $

$$
42 × 2 = (40 + 2) × 2 = 80 + 4 = \boxed{84}
$$

#### 3. $ 53 × 2 $

$$
53 × 2 = (50 + 3) × 2 = 100 + 6 = \boxed{106}
$$

#### 4. $ 84 × 2 $

$$
84 × 2 = (80 + 4) × 2 = 160 + 8 = \boxed{168}
$$

---

✔ Final Answers:

#### Addition
- $996 + 978 = \boxed{1974}$
- $896 + 968 = \boxed{1864}$
- $795 + 998 = \boxed{1793}$

#### Subtraction
- $926 - 658 = \boxed{268}$
- $835 - 368 = \boxed{467}$
- $956 - 598 = \boxed{358}$

#### Multiplication
- $21 × 2 = \boxed{42}$
- $42 × 2 = \boxed{84}$
- $53 × 2 = \boxed{106}$
- $84 × 2 = \boxed{168}$

Let me know if you'd like these written in a formatted worksheet style!