建筑工地运到水泥27吨，运到黄沙145吨，运到的石子比水泥、黄沙的总数少68吨．运到石子多少吨？
口算显身手．×2=×== 12﹣=×= 1×=×0= 3×=×=
口算题．×12=×= 60×=×=
阴影部分是 平方米． 如图求的是 的 是多少？列式计算 ．
计算下面各题：．
我是口算小能手．×=×=×=×=×=×=×=×=×=
×2=
×
=
=
=
×
= 1×
=
×0= 3×
=
×
=
×12=
×
=
=
×
=
．
×
=
×
=
×
=
×
=
×
=
×
=
×
=
×
=
×
=
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