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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%
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 =0.142857142857…≈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 =0.714285714285…≈0.714=71.4%
6/7 =0.857142857142…≈0.857=85.7%
熟记：142857
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