常用分数、小数的互化
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一、常用分数、小数的互化
1
/
2 =0.5=50%
1
/
3
≈0.333 =33.3%
2
/
3
≈0.667=66.7%
1
/
4 =0.25=25%
3
/
4
=0.75=75%
1
/
5 =0.2=20%
2
/
5
=0.4=40%
3
/
5 =0.6=60%
4
/
5
=0.8=80%
1
/
6 ≈0.167=16.7%
5
/
6 ≈
0.833=83.3%
1
/
8 =0.125=12.5%
3
/
8
=0.375=37.5%
5
/
8 =0.625=62.5%
7
/
8
=0.875=87.5%
1
/9
≈ 0.111=11.1%
1
/10 =0.1=10%
1
/
20=0.05=5%
3
/
20=0.15=15%
7
/
20=0.35=35%
9/
20=0.45=45%
11
/
20=0.55=55%
精选
13
/
20=0.65 =65%
17
/
20=0.85=85%
19/
20=0.95=95%
1
/16
=0.0625=6.25%
1
/
32
=0.03125=3.125%
1
/
64
=0.015625=1.5625%
1
/7 =0.7…≈0.143
=14.3%
2
/7
=0.285714285714…≈0.286=28.6%
3
/7
=0.428571428571…≈0.429=42.9%
4
/7
=0.57142857142…≈0.571=57.1%
5
/7 =0.7…≈0.714=71.4%
6
/7
=0.857142857142…≈0.857=85.7%
二、常用圆周率的计算
3.14×1=3.14
3.14×2=6.28
3.14×3=9.42
3.14×4=12.56
3.14×5=15.70
3.14×6=18.84
3.14×7=21.98
3.14×8=25.12
3.14×9=28.26
3.14×10=31.40
3.14×11=34.54
3.14×12=37.68
3.14×16=50.24
3.14×18=56.52
3.14×20=62.80
3.14×25=78.50
3.14×32=100.48
3.14×36=113.04
3.14×49=153.86
3.14×64=200.96
3.14×81=254.34
3.14×121=379.94
精选