【小数乘法简便运算50道带答案】在小学数学学习中,小数乘法是重要的计算内容之一。为了帮助学生更好地掌握小数乘法的简便运算技巧,以下整理了50道小数乘法简便运算题,并附有详细答案。这些题目涵盖常见的简算方法,如乘法交换律、结合律、分配律等,有助于提升学生的计算速度和准确性。
一、题目汇总(共50题)
题号 | 题目 | 简便方法 | 答案 |
1 | 0.25 × 4 × 8 | 0.25 × 4 = 1,再乘以8 | 8 |
2 | 0.5 × 6 × 2 | 0.5 × 2 = 1,再乘以6 | 6 |
3 | 1.25 × 8 × 0.4 | 1.25 × 8 = 10,再乘以0.4 | 4 |
4 | 0.2 × 5 × 7 | 0.2 × 5 = 1,再乘以7 | 7 |
5 | 0.75 × 4 × 2 | 0.75 × 4 = 3,再乘以2 | 6 |
6 | 2.5 × 4 × 0.6 | 2.5 × 4 = 10,再乘以0.6 | 6 |
7 | 0.125 × 8 × 10 | 0.125 × 8 = 1,再乘以10 | 10 |
8 | 0.6 × 5 × 0.2 | 0.6 × 0.2 = 0.12,再乘以5 | 0.6 |
9 | 0.3 × 10 × 0.4 | 0.3 × 0.4 = 0.12,再乘以10 | 1.2 |
10 | 1.5 × 2 × 0.6 | 1.5 × 2 = 3,再乘以0.6 | 1.8 |
11 | 0.25 × 16 × 0.5 | 0.25 × 0.5 = 0.125,再乘以16 | 2 |
12 | 0.5 × 8 × 0.25 | 0.5 × 0.25 = 0.125,再乘以8 | 1 |
13 | 0.4 × 25 × 0.6 | 0.4 × 0.6 = 0.24,再乘以25 | 6 |
14 | 0.75 × 10 × 0.8 | 0.75 × 0.8 = 0.6,再乘以10 | 6 |
15 | 0.2 × 10 × 0.5 | 0.2 × 0.5 = 0.1,再乘以10 | 1 |
16 | 0.1 × 100 × 0.8 | 0.1 × 0.8 = 0.08,再乘以100 | 8 |
17 | 0.6 × 10 × 0.5 | 0.6 × 0.5 = 0.3,再乘以10 | 3 |
18 | 0.25 × 12 × 0.4 | 0.25 × 0.4 = 0.1,再乘以12 | 1.2 |
19 | 0.5 × 12 × 0.2 | 0.5 × 0.2 = 0.1,再乘以12 | 1.2 |
20 | 0.25 × 20 × 0.4 | 0.25 × 0.4 = 0.1,再乘以20 | 2 |
21 | 0.125 × 16 × 0.8 | 0.125 × 0.8 = 0.1,再乘以16 | 1.6 |
22 | 0.75 × 12 × 0.4 | 0.75 × 0.4 = 0.3,再乘以12 | 3.6 |
23 | 0.3 × 20 × 0.5 | 0.3 × 0.5 = 0.15,再乘以20 | 3 |
24 | 0.6 × 10 × 0.4 | 0.6 × 0.4 = 0.24,再乘以10 | 2.4 |
25 | 0.4 × 5 × 0.5 | 0.4 × 0.5 = 0.2,再乘以5 | 1 |
26 | 0.25 × 8 × 0.5 | 0.25 × 0.5 = 0.125,再乘以8 | 1 |
27 | 0.5 × 4 × 0.6 | 0.5 × 0.6 = 0.3,再乘以4 | 1.2 |
28 | 0.2 × 5 × 0.4 | 0.2 × 0.4 = 0.08,再乘以5 | 0.4 |
29 | 0.75 × 8 × 0.2 | 0.75 × 0.2 = 0.15,再乘以8 | 1.2 |
30 | 0.125 × 10 × 0.8 | 0.125 × 0.8 = 0.1,再乘以10 | 1 |
31 | 0.6 × 2 × 0.5 | 0.6 × 0.5 = 0.3,再乘以2 | 0.6 |
32 | 0.3 × 8 × 0.5 | 0.3 × 0.5 = 0.15,再乘以8 | 1.2 |
33 | 0.25 × 10 × 0.4 | 0.25 × 0.4 = 0.1,再乘以10 | 1 |
34 | 0.5 × 6 × 0.2 | 0.5 × 0.2 = 0.1,再乘以6 | 0.6 |
35 | 0.2 × 10 × 0.5 | 0.2 × 0.5 = 0.1,再乘以10 | 1 |
36 | 0.75 × 2 × 0.8 | 0.75 × 0.8 = 0.6,再乘以2 | 1.2 |
37 | 0.4 × 10 × 0.5 | 0.4 × 0.5 = 0.2,再乘以10 | 2 |
38 | 0.125 × 4 × 0.8 | 0.125 × 0.8 = 0.1,再乘以4 | 0.4 |
39 | 0.6 × 5 × 0.2 | 0.6 × 0.2 = 0.12,再乘以5 | 0.6 |
40 | 0.3 × 4 × 0.5 | 0.3 × 0.5 = 0.15,再乘以4 | 0.6 |
41 | 0.25 × 6 × 0.4 | 0.25 × 0.4 = 0.1,再乘以6 | 0.6 |
42 | 0.5 × 10 × 0.4 | 0.5 × 0.4 = 0.2,再乘以10 | 2 |
43 | 0.2 × 20 × 0.5 | 0.2 × 0.5 = 0.1,再乘以20 | 2 |
44 | 0.75 × 4 × 0.6 | 0.75 × 0.6 = 0.45,再乘以4 | 1.8 |
45 | 0.125 × 8 × 0.2 | 0.125 × 0.2 = 0.025,再乘以8 | 0.2 |
46 | 0.6 × 8 × 0.5 | 0.6 × 0.5 = 0.3,再乘以8 | 2.4 |
47 | 0.3 × 5 × 0.4 | 0.3 × 0.4 = 0.12,再乘以5 | 0.6 |
48 | 0.25 × 2 × 0.8 | 0.25 × 0.8 = 0.2,再乘以2 | 0.4 |
49 | 0.5 × 2 × 0.6 | 0.5 × 0.6 = 0.3,再乘以2 | 0.6 |
50 | 0.4 × 5 × 0.2 | 0.4 × 0.2 = 0.08,再乘以5 | 0.4 |
二、总结
通过以上50道小数乘法简便运算题,可以看出,合理运用乘法的交换律、结合律和分配律,可以显著提高计算效率。例如:
- 0.25 × 4 = 1
- 0.5 × 2 = 1
- 1.25 × 8 = 10
- 0.125 × 8 = 1
这些常见组合可以帮助学生快速找到简便计算路径。建议在练习时多观察题目中的数字特征,灵活运用运算定律,从而提升计算能力和数学思维能力。