口算.20×4= 1﹣= 60×6= 12×0+4=84﹣8= 48÷6= 42×5≈ 182×7≈
计算下面各题． ．
= × ==．
口算显身手．×2=×== 12﹣=×= 1×=×0= 3×=×=
口算题．×12=×= 60×=×=
= 60×6= 12×0+4=
．
= × =
=
．
×2=
×
=
=
=
×
= 1×
=
×0= 3×
=
×
=
×12=
×
=
=
×
=
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