口算：
40×6= 56×4= 130×6= 19×5=
13×5= 12×7= 150×2= 230×4=
180×3= 120×4= 500×10= 140×7=
15×8= 80×9= 210×6= 16×5=
口算：
40×6= 56×4= 130×6= 19×5=
13×5= 12×7= 150×2= 230×4=
180×3= 120×4= 500×10= 140×7=
15×8= 80×9= 210×6= 16×5=
×3= 1÷
= 1﹣
﹣
×
= 3﹣4×
=
×12=
÷
=
+
= 1﹣
﹣
=
﹣
=
×3=
×
=
﹣0.25= 72×
=
÷
=
÷
= 36÷
=
÷
=
×16= 12÷
= 0.3×
=
÷
= 1÷
= 0×
=
=
=
= 0×
=
÷
×1.4=
×
=
×10= 30×0.05=
=
=
=
=
=
=
=
=
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