一个正方形花坛边长9米，在花坛四周铺上一圈小石头，石头路至少有多少米？一位老爷爷每分钟可走9米，走完一圈要几分钟？
直接写得数，做到又对又快．×= ÷1.5= × = 6﹣﹣=÷ = 0÷5×= 5﹣4÷5= 2×÷2×=
÷ × ÷ ×120÷ 120× ÷21 ×21．
先看清左右两题之间的关系，再写出得数．= = == = == =
算一算．×3= ×4= ×2== ÷3= ÷4=÷2= ÷2=
开火车．
×
= 
÷1.5= 
× =
6﹣
﹣
=
÷ =
0÷5×
= 5﹣4÷5= 2×
÷2×
÷
÷
×
÷21 
= 
= 
=
= 
= 
=
= 
=
×3= 
×4= 
×2=
= 
÷3= 
÷4=
÷2= 
÷2=
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