比一比．540÷9 480÷8 500÷50 600÷10560÷70 630÷70 720÷90 420÷60220×7 210×7 360×50 410×60．
直接写得数．×3= ×0×15= 0.6÷= 2﹣﹣=（2+）÷2= = （）×5= （）×12=
计算下面各题．．
× ÷ ÷ ÷× ÷÷．
直接写出得数．×= ××= ÷3= 12×= +﹣+=20÷= 18÷÷= ×= 0×= ×÷×=
口算56×= 2﹣= += 6×= 0.25×4= 57×=÷= 1÷= 21÷= ÷= 1÷= 0÷=
×3= 
×0×15= 0.6÷
= 2﹣
﹣
=
）÷2
= （
）×5= （
）×12=
．
×
÷
÷
÷
×
÷
÷
．
×
= 
×
×
= 
÷3= 12×
= 
+
﹣
+
=
= 18÷
÷
= 
= 0×
= 
×
÷
= 2﹣
= 
+
= 6×
= 0.25×4= 57×
=
÷
= 1÷
= 21÷
= 
÷
= 1÷
= 0÷
=
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