Let’s solve each multiplication problem step by step. We’ll multiply the top number by the bottom number, using the standard column method (also called long multiplication). I’ll go one by one and double-check each answer.
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1. 45 × 98
Break it down:
- Multiply 45 × 8 = 360
- Multiply 45 × 90 = 4050 (because 9 is in the tens place, so it’s really 90)
- Add them: 360 + 4050 =
4410
✔ Check: 45 × 100 = 4500, minus 45×2=90 → 4500 - 90 = 4410 ✔️
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2. 36 × 72
- 36 × 2 = 72
- 36 × 70 = 2520
- Add: 72 + 2520 =
2592
✔ Check: 36 × 70 = 2520, plus 36×2=72 → 2592 ✔️
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3. 48 × 29
- 48 × 9 = 432
- 48 × 20 = 960
- Add: 432 + 960 =
1392
✔ Check: 48 × 30 = 1440, minus 48 = 1392 ✔️
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4. 66 × 44
- 66 × 4 = 264
- 66 × 40 = 2640
- Add: 264 + 2640 =
2904
✔ Check: 66 × 44 = (60+6)(40+4) = 60×40 + 60×4 + 6×40 + 6×4 = 2400 + 240 + 240 + 24 = 2904 ✔️
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5. 86 × 56
- 86 × 6 = 516
- 86 × 50 = 4300
- Add: 516 + 4300 =
4816
✔ Check: 86 × 56 = let’s do 80×56 = 4480, 6×56=336 → 4480+336=4816 ✔️
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6. 74 × 21
- 74 × 1 = 74
- 74 × 20 = 1480
- Add: 74 + 1480 =
1554
✔ Check: 74 × 20 = 1480, plus 74 = 1554 ✔️
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7. 18 × 76
- 18 × 6 = 108
- 18 × 70 = 1260
- Add: 108 + 1260 =
1368
✔ Check: 18 × 76 = 18×(70+6)=1260+108=1368 ✔️
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8. 88 × 25
- 88 × 5 = 440
- 88 × 20 = 1760
- Add: 440 + 1760 =
2200
✔ Check: 88 × 25 = same as 88 × 100 ÷ 4 = 8800 ÷ 4 = 2200 ✔️
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9. 54 × 42
- 54 × 2 = 108
- 54 × 40 = 2160
- Add: 108 + 2160 =
2268
✔ Check: 54 × 40 = 2160, 54×2=108 → 2268 ✔️
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10. 19 × 18
- 19 × 8 = 152
- 19 × 10 = 190
- Add: 152 + 190 =
342
✔ Check: 20×18 = 360, minus 18 = 342 ✔️
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11. 51 × 73
- 51 × 3 = 153
- 51 × 70 = 3570
- Add: 153 + 3570 =
3723
✔ Check: 50×73 = 3650, 1×73=73 → 3650+73=3723 ✔️
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12. 63 × 79
- 63 × 9 = 567
- 63 × 70 = 4410
- Add: 567 + 4410 =
4977
✔ Check: 63 × 80 = 5040, minus 63 = 4977 ✔️
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13. 45 × 28
- 45 × 8 = 360
- 45 × 20 = 900
- Add: 360 + 900 =
1260
✔ Check: 45 × 28 = 45×(30-2)=1350-90=1260 ✔️
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14. 65 × 47
- 65 × 7 = 455
- 65 × 40 = 2600
- Add: 455 + 2600 =
3055
✔ Check: 65 × 50 = 3250, minus 65×3=195 → 3250 - 195 = 3055 ✔️
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Final Answer:
4410, 2592, 1392, 2904, 4816, 1554, 1368, 2200, 2268, 342, 3723, 4977, 1260, 3055
Parent Tip: Review the logic above to help your child master the concept of multiplication double digit worksheet.
