把下面的分?jǐn)?shù)化成百分?jǐn)?shù):
1
2
=
1
4
=
3
4
=
1
5
=
2
5
=
3
5
=
4
5
=
1
8
=
3
8
=
5
8
=
7
8
=
1
10
=
3
10
=
7
10
=
9
10
=
1
20
=
10
3
4
=
5
5
8
=
201
13
20
=
4
21
50
=
1
3
2
3
1
6
5
6
1
7
2
7
1
9
1
11
分析:把分?jǐn)?shù)化百分?jǐn)?shù),先用分?jǐn)?shù)的分子除以分母得出小數(shù)商,除不盡時(shí)通常保留三位小數(shù),再把小數(shù)點(diǎn)向右移動(dòng)兩位,同時(shí)填上百分號(hào)即可.
解答:
解:
1
2
=50%,
1
4
=25%,
3
4
=75%,
1
5
=20%,
2
5
=40%,
3
5
=60%,
4
5
=80%,
1
8
=12.5%,
3
8
=37.5%,
5
8
=62.5%,
7
8
=87.5%,
1
10
=10%,
3
10
=30%,
7
10
=70%,
9
10
=90%,
1
20
=5%,
10
3
4
=1075%,
5
5
8
=562.5%,
201
13
20
=20165%,
4
21
50
=442%,
1
3
≈33.3%,
2
3
≈66.7%,
1
6
≈16.7%,
5
6
≈83.3%,
1
7
≈14.3%,
2
7
≈28.6%,
1
9
≈11.1%,
1
11
≈9.1%.
點(diǎn)評(píng):此題考查分?jǐn)?shù)化百分?jǐn)?shù)方法的靈活運(yùn)用,熟記化法即可.
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科目:小學(xué)數(shù)學(xué) 來(lái)源:小學(xué)隨堂優(yōu)化作業(yè)·五年級(jí)數(shù)學(xué)下冊(cè)(配人教課標(biāo)版) 人教課標(biāo)版 題型:038

把下面的分?jǐn)?shù)化成小數(shù),并按要求取近似值.

  (精確到百分位)

(保留三位小數(shù))  (精確到十分位)

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