用竖式计算．42×19= 354÷6= 64×35= 5.4+1.36=
口算、心算我最强+ × 8.4÷0.7 470﹣72﹣28 5÷﹣ +÷+ ×× ×25% 698﹣299．
直接写出得数．28+43= 4﹣1.5= 2.5×4= 23.4÷10=1.5+6﹣1.5= 1﹣= ﹣= 4.8÷12=÷= 3.9×5×=
直接写得数．1﹣+1﹣= ﹣= 2.25×4= 0.67+0.33=÷= ×80%= （+）×12= 45%÷15%=
直接写出得数．﹣= 12﹣0.12= 5.8+8= 48+32= 32= 0÷= 4÷4%= 0.6×0.5= ×= += 1÷= +5= ．
+= 24×= 5﹣= ÷= 40×=×0.5= 0.4÷= ﹣= ÷0.4= +=
+
×
8.4÷0.7 470﹣72﹣28 5÷
+
×
×
×25% 698﹣299．
= 
﹣
= 4.8÷12=
= 3.9×5×
+1﹣
﹣
= 2.25×4= 0.67+0.33=
÷
= 
×80%= （
）×12= 45%÷15%=
﹣
= 12﹣0.12= 5.8+8= 48+32= 
= 4÷4%= 0.6×0.5= 
×
= 
+
= 1÷
= 
+5= ．
+
= 24×
= 5﹣
= 
÷
= 40×
=
= 
﹣
= 
÷0.4= 
+
=
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