直接写得数。0.45+0.37= 0.25×8= ÷3= 6×= += ÷=×= 1÷= ﹣= 1.25÷2.5= 44÷= +=
列竖式计算．
直接写出得数． 1﹣0.9= 23×50= 30×70= 80÷2= 2.8+0.2= 40×60= 32×40= 15×8=
心算． 2.3+2.2= 5.62﹣2.02= 0.25+1.8= 9.5﹣1.3= 1.3﹣0.8= 3.5﹣0.5= 1.95÷3.05= 2.3+1.6= 5.31﹣2.01=
计算．
÷3= 6×
= 
+
= 
÷
=
×
= 1÷
= 
﹣
= 1.25÷2.5= 44÷
= 
+
=
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