小学数学必备数值(共12页).doc

精选优质文档-倾情为你奉上小学数学必备数值常用小数、分数的转化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%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%1/16 =0.0625=6.25%1/32 =0.03125=3.125%1/64 =0.=1.5625%1/7 =0.70.143=14.3%常用圆周率计算3.141=3.143.142=6.283.143=9.423.144=12.563.145=15.703.146=18.84 3.147=21.983.148=25.12