Let’s solve each multiplication problem step by step. We’ll do them one at a time, carefully checking our work.
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(1) 54 × 42
Break it down:
54 × 40 = 2160
54 × 2 = 108
Add them: 2160 + 108 =
2268
✔ Check: 50×42=2100, 4×42=168 → 2100+168=2268 ✔️
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(2) 92 × 96
Use (90+2)(90+6) or just multiply directly:
92 × 90 = 8280
92 × 6 = 552
Add: 8280 + 552 =
8832
✔ Check: 100×96=9600 minus 8×96=768 → 9600-768=8832 ✔️
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(3) 49 × 49
This is 49 squared. Think of it as (50 - 1)² = 2500 - 100 + 1 =
2401
Or: 49 × 50 = 2450, minus 49 = 2450 - 49 =
2401
✔️
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(4) 74 × 15
74 × 10 = 740
74 × 5 = 370
Add: 740 + 370 =
1110
✔️
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(5) 31 × 45
30 × 45 = 1350
1 × 45 = 45
Add: 1350 + 45 =
1395
✔️
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(6) 86 × 53
86 × 50 = 4300
86 × 3 = 258
Add: 4300 + 258 =
4558
✔️
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(7) 68 × 13
68 × 10 = 680
68 × 3 = 204
Add: 680 + 204 =
884
✔️
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(8) 36 × 97
Think: 36 × 100 = 3600, minus 36 × 3 = 108
So: 3600 - 108 =
3492
✔️
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(9) 80 × 28
80 × 20 = 1600
80 × 8 = 640
Add: 1600 + 640 =
2240
✔️
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(10) 82 × 39
82 × 40 = 3280, minus 82 = 3280 - 82 =
3198
✔️
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(11) 92 × 82
90 × 82 = 7380
2 × 82 = 164
Add: 7380 + 164 =
7544
✔️
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(12) 98 × 80
100 × 80 = 8000, minus 2 × 80 = 160 → 8000 - 160 =
7840
✔️
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(13) 44 × 33
44 × 30 = 1320
44 × 3 = 132
Add: 1320 + 132 =
1452
✔️
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(14) 57 × 47
57 × 40 = 2280
57 × 7 = 399
Add: 2280 + 399 =
2679
✔️
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(15) 93 × 20
Just add a zero to 93 × 2 = 186 → so
1860
✔️
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Final Answer:
(1) 2268
(2) 8832
(3) 2401
(4) 1110
(5) 1395
(6) 4558
(7) 884
(8) 3492
(9) 2240
(10) 3198
(11) 7544
(12) 7840
(13) 1452
(14) 2679
(15) 1860
Parent Tip: Review the logic above to help your child master the concept of multiplying by 2 digits worksheet.
