口算．2×= 1.5÷= ×0.8= ×9= 1.2÷=÷2= ÷= 2.4÷= 1÷5= ÷3=
脱式计算，能简算的要简算． ①②③ ④⑤⑥15×4.6﹣46×0.5．
看谁算的又对又快．+=+=﹣=﹣= 1﹣=+=﹣= 1﹣=+=﹣=+=+=
看谁算得快． 1﹣﹣﹣+ 0.75+++0.25+0.625．
6﹣3﹣0.625．
计算．
= 1.5÷
= 
×0.8= 
×9= 1.2÷
=
÷2= 
÷
= 2.4÷
= 1÷5
= 
÷3=
②
③
⑤
⑥15×4.6﹣46×0.5．
+
=
=
﹣
=
﹣
=
=
+
﹣
= 1﹣
=
+
=
﹣
=
+
=
+
=
﹣
﹣
+
+
+0.25+0.625．
﹣3
﹣0.625．
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