小学常用π值(共2页).doc

精选优质文档-倾情为你奉上小学常用值1 3.14 2 6.28 3 9.42 4 12.56 5 15.7 6 18.84 7 21.98 8 25.12 9 28.26 10 31.4 11 34.54 1237.6813 40.82 14 43.96 15 47.1 16 50.24 17 53.38 18 56.52 19 59.66 24 75.36 2578.5 32100.48 36113.04 45 141.348150.72 64 200.96 1.5= 2.25 7.065 2.5= 6.25 19.625 常用小数、分数、百分数互化1/2 = 0.5 = 50%