比较下面每组数的大小（1）和0.4 （2）和3.42
直接写出得数．×= ××= ÷3= 12×= +﹣+=20÷= 18÷÷= ×= 0×= ×÷×=
口算56×= 2﹣= += 6×= 0.25×4= 57×=÷= 1÷= 21÷= ÷= 1÷= 0÷=
计算下面各题．×21× ÷5× ÷÷÷÷24 ×÷8．
计算．×9= ×0= 0÷= ÷=12×= ×= ÷= ÷=
直接写得数×= ÷5= ×12= ×= ÷=÷= ×= 1÷= = 45×=÷2= ÷= ×= ÷= ×0=×= 1﹣= ÷= ×= 15÷=
和0.4 （2）
和3.42
×
= 
×
×
= 
÷3= 12×
= 
+
﹣
+
=
= 18÷
÷
= 
= 0×
= 
×
÷
= 2﹣
= 
+
= 6×
= 0.25×4= 57×
=
÷
= 1÷
= 21÷
= 
÷
= 1÷
= 0÷
=
×21×
÷5×
÷
÷
÷
÷24 
×
÷8．
×9= 
×0= 0÷
= 
÷
=
×
= 
÷
= 
÷
=
×
= 
÷5= 
×12= 
×
= 
÷
÷
= 
×
= 1÷
= 
= 45×
=
÷2= 
÷
= 
×
= 
= 
×0=
×
= 1﹣
= 
÷
= 
×
= 15÷
=
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