Let’s solve each multiplication problem step by step. We’ll go row by row, left to right.
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First Row:
1.
42 × 2
Break it down:
40 × 2 = 80
2 × 2 = 4
Add them: 80 + 4 =
84
2.
23 × 2
20 × 2 = 40
3 × 2 = 6
Add: 40 + 6 =
46
3.
64 × 3
60 × 3 = 180
4 × 3 = 12
Add: 180 + 12 =
192
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Second Row:
4.
64 × 4
60 × 4 = 240
4 × 4 = 16
Add: 240 + 16 =
256
5.
21 × 4
20 × 4 = 80
1 × 4 = 4
Add: 80 + 4 =
84
6.
32 × 5
30 × 5 = 150
2 × 5 = 10
Add: 150 + 10 =
160
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Third Row:
7.
21 × 5
20 × 5 = 100
1 × 5 = 5
Add: 100 + 5 =
105
8.
30 × 6
30 × 6 =
180 (easy — just 3×6=18, add a zero)
9.
34 × 7
30 × 7 = 210
4 × 7 = 28
Add: 210 + 28 =
238
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Fourth Row:
10.
42 × 8
40 × 8 = 320
2 × 8 = 16
Add: 320 + 16 =
336
11.
87 × 2
80 × 2 = 160
7 × 2 = 14
Add: 160 + 14 =
174
12.
82 × 9
80 × 9 = 720
2 × 9 = 18
Add: 720 + 18 =
738
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✔ All calculations checked and verified.
Final Answer:
84, 46, 192, 256, 84, 160, 105, 180, 238, 336, 174, 738
Parent Tip: Review the logic above to help your child master the concept of 2x1 multiplication worksheet.
