小数的简便计算超多知识讲解文档格式.docx
- 文档编号:19176415
- 上传时间:2023-01-04
- 格式:DOCX
- 页数:7
- 大小:19.65KB
小数的简便计算超多知识讲解文档格式.docx
《小数的简便计算超多知识讲解文档格式.docx》由会员分享,可在线阅读,更多相关《小数的简便计算超多知识讲解文档格式.docx(7页珍藏版)》请在冰豆网上搜索。
5.44
9.7×
99+9.73.14×
0.68+31.4×
0.03227.5×
3.7-7.5×
3.78.54÷
0.40.65×
101
3.2×
0.25×
12.5(45.9-32.7)÷
8÷
0.1255.6÷
0.44.36×
12.5×
8
7.2×
0.2+2.4×
1.48.9×
1.017.74×
(2.8-1.3)+1.5×
2.263.9×
2.7+3.9×
7.3
18-1.8÷
0.125÷
0.812.7×
9.9+1.2721×
(9.3-3.7)-5.65.4×
11-5.44.5÷
1.8
4.2÷
3.563.4÷
0.44.9÷
1.43.9÷
(1.3×
5)930÷
0.6÷
52.5×
2.4
小数简便计算练习一
小数简便计算的方法:
(整数的运算定律在小数中同样适用)
1、加法交换律与结合律的运用。
2、乘法交换律与结合律的运用。
下面各题怎样算简便就怎样算。
(一)小数加减法计算
3.2+0.36+4.8+1.640.456+6.22+3.786.9+4.8+3.15.27+2.86-0.66+1.63
1.29+3.7+2.71+6.30.398+0.36+3.64
4.02+5.4+0.985.17-1.8-3.2
73.8-1.64-13.8-5.367.14-0.53-2.4736.8-3.9-6.13.68+7.56-2.68
35.6-1.8-15.6-7.266.86-8.66-1.349.6+4.8-3.647.8-7.45+8.8
7.85+2.34-0.85+4.6613.35-4.68+2.65
(二)小数乘除法计算
16.2×
4320÷
83.9÷
5)2.7÷
45
3.52÷
0.49.6÷
0.42.5×
2.415÷
(0.15×
0.4)
12.58.54÷
0.40.25×
0.73×
44.6÷
3.5
小数简便计算练习二
3.82+2.9+0.18+9.11.27+3.9+0.73+16.11.57+0.245+7.431.76+0.195+3.24
2.64+8.67+7.36+11.330.134+2.66+0.86615.02-6.8-1.028-2.45-1.55
23.4-0.8-13.4-7.23.25+1.79-0.59+1.751.23+3.4-0.23+6.67.5+4.9-6.5
13.75-(3.75+6.48)15.89+(6.75-5.89)12.7-(3.7+0.84)
0.8×
(4.3×
1.25)4.36×
80.25×
44.5÷
1.8
320÷
817.8÷
4)12.5×
0.96×
0.81.25×
32
0.35×
(1.25×
2)×
0.863.4÷
0.40.25×
364.9÷
1.4
小数简便计算练习三
2.35+1.713+0.287+7.654.8+8.63+5.2+0.375.93+0.19+2.816.02+3.6+1.98
67.34+21.56+2.66+8.440.74+19.16+9.26+0.823.9-4.1+6.1-5.914-7.32-2.68
15.75+3.59-0.59+14.2525.48-(9.4-0.52)9.43-(6.28-1.57)146.5-(23+46.5)
36.54-1.76-4.543.07-0.38-1.6232+4.9-0.9
12.512.5×
0.84.2÷
3.50.49÷
15.2÷
41.25×
3218-1.8÷
0.8930÷
5
2.31×
1.6×
0.5×
1.250.25×
8.5×
415÷
0.2570÷
28
5.6÷
0.40.125×
16
小数简便计算练习四
乘法交换律与结合律、分配律的运用。
表面上看来,左右两边没有相同的因数,不能使用乘法分配律。
我们可以通过变一变,分一分的方法找出相同因数再运用乘法分配律进行计算。
乘法分配律的运用一
7.09×
7.093.72×
3.5+6.28×
3.527.5×
3.7
3.83×
5.443.9×
7.37.6×
0.8+0.2×
7.6
乘法分配律的运用二
3.14×
0.03232.4×
0.09+0.1×
3.241.28×
8.6+7.2×
86
2.3×
16+2.3×
22+23×
0.29.16×
15-0.5×
91.6101×
0.87-0.91×
87
乘法分配律的运用三
28.6×
101-28.61.87×
9.9+0.18758.5×
81-8.5
(45.9-32.7)÷
0.125(1.25-0.125)×
8(2.5-0.25)×
0.4
乘法分配律的运用四
100.10.79×
1990.85×
1990.65×
101
3.65×
10.14.6×
1027.74×
2.2646×
57+23×
86
9.16×
2.53-0.053×
91.6-9.16
小数简便计算练习五
0.86×
15.7-0.86×
14.75.8×
4.8+4.8×
4.26.12×
1.25-2.12×
1.25
7.097.24×
5.2+2.76×
5.236.7×
3.7-3.7×
6.7
4.7-36.5×
0.378.8×
0.25-0.48×
2.548×
0.56+44×
0.48
10.7×
16.1-151×
1.073.4×
10.9+34-0.34×
1912.7×
9.9+1.27
18.76×
9.9+18.7656.5×
9.9+56.55.4×
11-5.4
21×
(9.3-3.7)-5.6(7.7+1.54)÷
0.710.4-9.6×
0.35
0.89×
100.10.85×
9.90.32×
4034.96×
258.9×
1.01
10.10.279×
343+6.07×
27.9+5×
2.797.2×
1.414.23×
12.3-1.423×
22-1423
小数简便计算练习六
16.8-12.8×
12.515.6×
2.1-15.6×
1.110.7×
16.1-15.1×
10.7
10.6×
0.35-9.6×
0.3527.6×
8.3-7.6×
8.31.28×
8.6+0.72×
8.6
0.527.2×
1.44.8×
0.52
0.264×
519+264×
0.4812.22×
9.9+6.66×
6.745×
21-50×
2.1
23+2.33.12+3.12×
993.6-3.6×
0.5
98-9.7+9.7×
312.7×
9.9+1.2746.2×
99+46.2
9.3×
100.10.125×
963.4×
1020.39×
1992.4×
102
10.87.74×
2.26158+45×
1.58-5.5×
15.8
15.6×
2.10.25×
4(1.25-0.125)×
83.6×
102
83.72×
3.514.8×
0.520.8×
100.14.2÷
5.6×
2.17.09×
7.7+1.54)÷
0.72.7÷
4515÷
0.4)0.35×
1.25×
2×
0.832.4×
0.9+0.1×
32.4
15÷
0.25(2.5-0.25)×
0.49.16×
1.5-0.5×
9.163.6-3.6×
0.570÷
1.25)3.12+3.12×
9928.6×
101-28.60.86×
14.7
2.4×
1022.31×
1.2×
0.57.6×
7.60.85×
1990.25×
1.28×
8.612.5×
0.810.4-9.6×
0.350.25×
360.79×
199
40.32×
40346×
8613.7×
0.25-3.7÷
42.22×
6.7
23+2.3101×
8710.7×
10.73.65×
0.37
5.83×
2+4.27(45.9-32.7)÷
0.1259.7×
99+9.74.36×
8
15.6×
2.10.65×
10127.5×
3.78.54÷
0.43.83×
5.44
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 小数 简便 计算 知识 讲解
![提示](https://static.bdocx.com/images/bang_tan.gif)