Let's solve each of these multiplication problems step by step using the
column method (also known as long multiplication). We'll multiply each number in the top row by each digit in the bottom number, then add the results.
---
1. 22 × 21
```
22
× 21
----
22 ← 22 × 1
440 ← 22 × 20 (shifted one place to the left)
----
462
```
✔ Answer: 462
---
2. 82 × 14
```
82
× 14
----
328 ← 82 × 4
820 ← 82 × 10 (shifted)
----
1148
```
✔ Answer: 1148
---
3. 58 × 31
```
58
× 31
----
58 ← 58 × 1
1740 ← 58 × 30 (shifted)
----
1798
```
✔ Answer: 1798
---
4. 40 × 27
```
40
× 27
----
0 ← 40 × 7 = 280 → but written as 0? Wait, better:
280 ← 40 × 7
800 ← 40 × 20 (shifted)
----
1080
```
Wait — let's do it properly:
- 40 × 7 = 280
- 40 × 20 = 800
Add:
280 + 800 =
1080
✔ Answer: 1080
---
5. 74 × 26
```
74
× 26
----
444 ← 74 × 6
1480 ← 74 × 20
----
1924
```
✔ Answer: 1924
---
6. 63 × 28
```
63
× 28
----
504 ← 63 × 8
1260 ← 63 × 20
----
1764
```
✔ Answer: 1764
---
7. 41 × 12
```
41
× 12
----
82 ← 41 × 2
410 ← 41 × 10
----
492
```
✔ Answer: 492
---
8. 39 × 30
```
39
× 30
----
0 ← 39 × 0 = 0
1170 ← 39 × 30
----
1170
```
Or simply: 39 × 30 = 39 × 3 × 10 = 117 × 10 =
1170
✔ Answer: 1170
---
9. 67 × 10
This is easy: any number × 10 just adds a zero.
67 × 10 =
670
✔ Answer: 670
---
10. 48 × 32
```
48
× 32
----
96 ← 48 × 2
1440 ← 48 × 30
----
1536
```
✔ Answer: 1536
---
11. 77 × 16
```
77
× 16
----
462 ← 77 × 6
770 ← 77 × 10
----
1232
```
✔ Answer: 1232
---
12. 86 × 35
```
86
× 35
----
430 ← 86 × 5
2580 ← 86 × 30
----
2910
```
✔ Answer: 2910
---
✔ Final Answers:
1.
462
2.
1148
3.
1798
4.
1080
5.
1924
6.
1764
7.
492
8.
1170
9.
670
10.
1536
11.
1232
12.
2910
---
Let me know if you'd like this formatted into a printable worksheet or want explanations for any specific problem!
Parent Tip: Review the logic above to help your child master the concept of 4 multiplication worksheet.
