Let's solve each multiplication problem step by step. I'll go through them one at a time and show the calculations.
---
1. 38 × 21
Break it down:
- 38 × 20 = 760
- 38 × 1 = 38
- Add: 760 + 38 =
798
✔ Answer: 798
---
2. 25 × 22
- 25 × 20 = 500
- 25 × 2 = 50
- Add: 500 + 50 =
550
✔ Answer: 550
---
3. 34 × 33
Use distributive property:
- 34 × 30 = 1020
- 34 × 3 = 102
- Add: 1020 + 102 =
1122
✔ Answer: 1122
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4. 50 × 10
- 50 × 10 =
500
✔ Answer: 500
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5. 45 × 27
Break into:
- 45 × 20 = 900
- 45 × 7 = 315
- Add: 900 + 315 =
1215
✔ Answer: 1215
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6. 36 × 32
- 36 × 30 = 1080
- 36 × 2 = 72
- Add: 1080 + 72 =
1152
✔ Answer: 1152
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7. 68 × 51
- 68 × 50 = 3400
- 68 × 1 = 68
- Add: 3400 + 68 =
3468
✔ Answer: 3468
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8. 24 × 19
- 24 × 20 = 480
- Subtract 24 (because 19 is 1 less than 20): 480 – 24 =
456
✔ Answer: 456
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9. 80 × 60
- 8 × 6 = 48 → add two zeros →
4800
✔ Answer: 4800
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10. 53 × 33
- 53 × 30 = 1590
- 53 × 3 = 159
- Add: 1590 + 159 =
1749
✔ Answer: 1749
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11. 29 × 29
This is 29²:
- 30 × 30 = 900
- But subtract 30 + 29 = 59 → 900 – 59 = 841
Or: (30 - 1)² = 900 - 60 + 1 =
841
✔ Answer: 841
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12. 74 × 61
- 74 × 60 = 4440
- 74 × 1 = 74
- Add: 4440 + 74 =
4514
✔ Answer: 4514
---
13. 36 × 35
- 36 × 30 = 1080
- 36 × 5 = 180
- Add: 1080 + 180 =
1260
✔ Answer: 1260
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14. 97 × 18
- 97 × 10 = 970
- 97 × 8 = 776
- Add: 970 + 776 =
1746
✔ Answer: 1746
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15. 42 × 25
Note: 25 = 100 ÷ 4, so multiply by 100 and divide by 4:
- 42 × 100 = 4200
- 4200 ÷ 4 =
1050
Alternatively:
- 42 × 20 = 840
- 42 × 5 = 210
- Add: 840 + 210 =
1050
✔ Answer: 1050
---
16. 84 × 43
- 84 × 40 = 3360
- 84 × 3 = 252
- Add: 3360 + 252 =
3612
✔ Answer: 3612
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✔ Final Answers:
```
38 × 21 = 798
25 × 22 = 550
34 × 33 = 1122
50 × 10 = 500
45 × 27 = 1215
36 × 32 = 1152
68 × 51 = 3468
24 × 19 = 456
80 × 60 = 4800
53 × 33 = 1749
29 × 29 = 841
74 × 61 = 4514
36 × 35 = 1260
97 × 18 = 1746
42 × 25 = 1050
84 × 43 = 3612
```
Let me know if you'd like this formatted as a printable worksheet or need explanations for any specific problem!
Parent Tip: Review the logic above to help your child master the concept of 2 digit by 2 digit multiplication worksheet grade 4.
