Question

填小数． 1 2 =	1 4 =	3 4 =	1 5 =
2 5 =	3 5 =	4 5 =	1 8 =
3 8 =	5 8 =	7 8 =	1 10 =
1 16 =	1 20 =	1 25 =	1 50 =

Answer 1

考点：小数与分数的互化

专题：分数和百分数

分析：分数化成小数：用分子除以分母即可．

解答： 解：

1 2 =0.5	1 4 =0.25	3 4 =0.75	1 5 =0.2
2 5 =0.4	3 5 =0.6	4 5 =0.8	1 8 =0.125
3 8 =0.375	5 8 =0.625	7 8 =0.875	1 10 =0.1
1 16 =0.0625	1 20 =0.05	1 25 =0.04	1 50 =0.02

故答案为：0.5；0.25；0.75；0.2；0.4；0.6；0.8；0.125；0.375；0.625；0.875；0.1；0.0625；0.05；0.04；0.02．

点评：本题主要考查分数和小数的互化的方法．分数化成小数：用分子除以分母即可；小数化成分数的方法：一位小数化成十分之几，两位小数化成百分之几，三位小数化成千分之几…，能约分的要约分．