一、常用的 倍1 3.14 5 15.7 9 28.26 36 113.042 6.28 6 18.84 10 31.4 49 153.863 9.42 7 21.98 16 50.24 64 200.964 12.56 8 25.12 25 78.5 81 254.342、常用的分数、小数及百分数的互化=0.5=50% =0.25=25% =0.75=75%12 14 34=0.2=20% =0.4=40% =0.6=60% =0.8=80%15 25 35 45=0.125=12.5% =0.375=37.5% =0.625=62.5% =0.875=87.5%18 38 58 78=0.1=10% =0.0625=6.25% =0.05=5% =0.04=4%110 116 120 125=0.02=2% =0.01=1%150 1100
