公务员考试中常用特殊小数

“多位特殊小数”及其对应分数

33.3%=0.333≈1 66.7%=0.667

3≈23

25.0%=0.250 =14 16.7%=0.167≈16 14.3%=0.143≈17 42.9%=0.429≈37 71.4%=0.714≈57 12.5%=0.125 =18 62.5%=0.625 =58 11.1%=0.111≈19 44.4%=0.444≈49 77.8%=0.778≈79 9.1%=0.091≈111 7.7%=0.077≈113 75.0%=0.750 =3483.3%=0.833≈56

28.6%=0.286≈27

57.5%=0.575≈47

85.7%=0.857≈67

37.5%=0.375 =3887.5%=0.875 =78≈29

55.6%=0.556≈59

88.9%=0.889≈89

8.3%=0.083≈112

7.1%=0.071≈114

22.2%=0.222 6.7%=0.0676.25%=0.0625=1

16≈

1 15

特殊分数的记忆方式

1727374742857=0.1=0.

5728571

4,=0.

4,28571=0.571428,

=0.714285,6=0.857142

71 2=0.199，4，5，7，8；

99991=0.09  2，3，4，5，6，7，8，9，10 11111111111111111111无限不循环小数

2≈1.4141.414×1.414≈2 ；3≈1.7321.732×1.732≈3 5≈2.2362.236×2.236≈5 ；6≈2.4492.449×2.449≈6 7≈2.6462.646×2.646≈7 ；8≈2.8282.828×2.828≈8

10≈3.1623.162×3.162≈10

11～30的平方数

112=121 122=144 132=169 142=196 152=225 162=256 172=289 182=324 192=361 202=400