Let’s solve each multiplication problem step by step. We’ll multiply the numbers as if they were whole numbers first, then count the total decimal places in both numbers and put the decimal point in the answer accordingly.
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First Row:
1.
2.3 × 4.6
→ 23 × 46 = 1058
→ Total decimals: 1 (from 2.3) + 1 (from 4.6) = 2
→ Answer:
10.58
2.
0.67 × 0.50
→ 67 × 50 = 3350
→ Total decimals: 2 + 2 = 4
→ Answer:
0.3350 → simplify to
0.335
3.
0.27 × 73
→ 27 × 73 = 1971
→ Total decimals: 2 + 0 = 2
→ Answer:
19.71
4.
2.8 × 32
→ 28 × 32 = 896
→ Total decimals: 1 + 0 = 1
→ Answer:
89.6
5.
3.1 × 94
→ 31 × 94 = 2914
→ Total decimals: 1 + 0 = 1
→ Answer:
291.4
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Second Row:
6.
6.5 × 6.6
→ 65 × 66 = 4290
→ Total decimals: 1 + 1 = 2
→ Answer:
42.90 → simplify to
42.9
7.
3.3 × 0.89
→ 33 × 89 = 2937
→ Total decimals: 1 + 2 = 3
→ Answer:
2.937
8.
48 × 48
→ 48 × 48 = 2304
→ No decimals → Answer:
2304
9.
5.4 × 0.19
→ 54 × 19 = 1026
→ Total decimals: 1 + 2 = 3
→ Answer:
1.026
10.
47 × 14
→ 47 × 14 = 658
→ No decimals → Answer:
658
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Third Row:
11.
5.8 × 4.3
→ 58 × 43 = 2494
→ Total decimals: 1 + 1 = 2
→ Answer:
24.94
12.
0.46 × 0.50
→ 46 × 50 = 2300
→ Total decimals: 2 + 2 = 4
→ Answer:
0.2300 → simplify to
0.23
13.
53 × 7.8
→ 53 × 78 = 4134
→ Total decimals: 0 + 1 = 1
→ Answer:
413.4
14.
3.0 × 0.49
→ 30 × 49 = 1470
→ Total decimals: 1 + 2 = 3
→ Answer:
1.470 → simplify to
1.47
15.
87 × 0.21
→ 87 × 21 = 1827
→ Total decimals: 0 + 2 = 2
→ Answer:
18.27
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Fourth Row:
16.
47 × 0.12
→ 47 × 12 = 564
→ Total decimals: 0 + 2 = 2
→ Answer:
5.64
17.
84 × 18
→ 84 × 18 = 1512
→ No decimals → Answer:
1512
18.
6.7 × 0.95
→ 67 × 95 = 6365
→ Total decimals: 1 + 2 = 3
→ Answer:
6.365
19.
0.83 × 8.9
→ 83 × 89 = 7387
→ Total decimals: 2 + 1 = 3
→ Answer:
7.387
20.
1.2 × 0.54
→ 12 × 54 = 648
→ Total decimals: 1 + 2 = 3
→ Answer:
0.648
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Fifth Row:
21.
0.13 × 4.3
→ 13 × 43 = 559
→ Total decimals: 2 + 1 = 3
→ Answer:
0.559
22.
0.89 × 0.34
→ 89 × 34 = 3026
→ Total decimals: 2 + 2 = 4
→ Answer:
0.3026
23.
0.31 × 0.93
→ 31 × 93 = 2883
→ Total decimals: 2 + 2 = 4
→ Answer:
0.2883
24.
8.1 × 16
→ 81 × 16 = 1296
→ Total decimals: 1 + 0 = 1
→ Answer:
129.6
25.
13 × 0.76
→ 13 × 76 = 988
→ Total decimals: 0 + 2 = 2
→ Answer:
9.88
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Final Answer:
10.58, 0.335, 19.71, 89.6, 291.4,
42.9, 2.937, 2304, 1.026, 658,
24.94, 0.23, 413.4, 1.47, 18.27,
5.64, 1512, 6.365, 7.387, 0.648,
0.559, 0.3026, 0.2883, 129.6, 9.88
Parent Tip: Review the logic above to help your child master the concept of double digit multiplication with decimals worksheet.
