口算．40×4= 30×6= 5×70= 300×3= 5×400=600×9= 60×3= 80×4= 276×0=
计算：+= ﹣= 12×= ÷=0×+9= ÷3= ×14= 20÷=1.25××8= 14×÷14×=
+= 6÷= ×0.25= ÷=×= 9﹣= ÷42= 1÷=
口算= = = =÷= ×36= ÷3= 6÷=
直接写出计算结果．+= ×0×27= 6÷= ×39= 24÷=×4﹣2= 45÷= 1﹣﹣= +÷+= ×÷×=
直接写出得数．1÷= += ÷= （﹣）×18=÷3= ×= ﹣= ×÷×=
+
= 
﹣
= 12×
= 
÷
=
+9= 
÷3= 
×14= 20÷
=
×8= 14×
÷14×
+
= 6÷
= 
×0.25= 
÷
=
×
= 9﹣
= 
÷42= 1÷
=
= 
= 
= 
=
÷
= 
×36= 
÷3= 6÷
=
+
= 
×0×27= 6÷
= 
×39= 24÷
=
×4﹣2= 45÷
= 1﹣
﹣
= 
+
÷
= 
×
÷
×
=
= 
+
= 
÷
= （
﹣
）×18=
÷3= 
×
﹣
= 
×
÷
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