This worksheet provides nine practice problems for multiplying three-digit numbers by two-digit numbers on a grid.

Let's solve each multiplication problem in the grid step by step.

---

1. 234 × 12

Break it down:

- 234 × 2 = 468
- 234 × 10 = 2,340

Now add:
```
468
+2340
-----
2808
```

✔ Answer: 2,808

---

2. 432 × 21

Break it down:

- 432 × 1 = 432
- 432 × 20 = 8,640

Add:
```
432
+8640
-----
9072
```

✔ Answer: 9,072

---

3. 324 × 11

Use the trick:
Multiply by 10 and add the original number.

- 324 × 10 = 3,240
- 324 × 1 = 324
- Add: 3,240 + 324 = 3,564

✔ Answer: 3,564

---

4. 622 × 31

Break it down:

- 622 × 1 = 622
- 622 × 30 = 18,660

Add:
```
622
+18660
------
19282
```

✔ Answer: 19,282

---

5. 135 × 21

- 135 × 1 = 135
- 135 × 20 = 2,700

Add:
```
135
+2700
-----
2835
```

✔ Answer: 2,835

---

6. 531 × 22

Break it down:

- 531 × 2 = 1,062
- 531 × 20 = 10,620

Add:
```
1062
+10620
------
11682
```

✔ Answer: 11,682

---

7. 721 × 13

- 721 × 3 = 2,163
- 721 × 10 = 7,210

Add:
```
2163
+7210
-----
9373
```

✔ Answer: 9,373

---

8. 421 × 31

- 421 × 1 = 421
- 421 × 30 = 12,630

Add:
```
421
+12630
------
13051
```

✔ Answer: 13,051

---

9. 231 × 32

- 231 × 2 = 462
- 231 × 30 = 6,930

Add:
```
462
+6930
-----
7392
```

✔ Answer: 7,392

---

✔ Final Answers:

| Problem | Answer |
|---------------|------------|
| 234 × 12 | 2,808 |
| 432 × 21 | 9,072 |
| 324 × 11 | 3,564 |
| 622 × 31 | 19,282 |
| 135 × 21 | 2,835 |
| 531 × 22 | 11,682 |
| 721 × 13 | 9,373 |
| 421 × 31 | 13,051 |
| 231 × 32 | 7,392 |

You can now fill these answers into the grid!

Let me know if you'd like a visual layout or explanation of any specific step!