时间的换算与计算课件

Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,时、分、秒,2,、时间的换算与计算,时、分、秒2、时间的换算与计算,1,、口算天天练,（,1,）我们学过的时间单位有（）、（）和（），其中（）是最小的时间单位。,（,2,）钟面上有（）个大格，有（）个小格。时针走一大格是（），分针走一小格是（）分。,（,3,）时针走一大格，分针正好走（）圈。,（,4,）,1,小时（）分,1,分（）秒,1、口算天天练,一、故事导入,开学了，熊大和熊二从熊堡出发去学校，熊大用了,2,小时，熊二用了,120,分钟，熊大说它用的时间少，熊二说它的用时少，它俩谁也不甘示弱。同学们，请你当裁判,它们俩究竟谁用的时间少？,一、故事导入 开学了，熊大和熊二从熊堡出发去学校，,绿色圃中小学教育网http:/,2,时（）分,60,60,120,120,1,时是,60,分，,2,时是,2,个,60,分。,你是怎样想的？,二、探究新知,绿色圃中小学教育网http:/2,2,时,=,（）分,1,时是,60,分，,那,2,时（）分,120,120,1,分是,60,秒，,那,3,分（）秒,3,分,=,（）秒,180,180,2时=（）分1时是60分，1201201分,我会填：,3,时（）分,240,分（）,时,4,分,（）,秒,180,秒,（）,分,2,时,15,分,（）分,160,秒,=,（）分（）秒,要求：,学生独立完成，集体订正时说说自己是怎样想的。,我会填：,二、探究新知,你从中获得了哪些有意义的数学信息？,你能提出什么数学问题？,小明从家到学校用了多长时间？,二、探究新知你从中获得了哪些有意义的数学信息？你能提出什么,二、探究新知,（,3,）都是,7,时多，直接用,45-30,算出用了,15,分。,（,1,）直接数一数，,7:30,到,7:45,分针走了,15,分。,（,2,）,7:30,到,7:45,分针走了,3,个大格，是,15,分钟。,二、探究新知（3）都是7时多，直接用45-30算出用了15分,绿色圃中小学教育网http:/,二、探究新知,经过时间,结束时间,开始时间,开始时间,经过时间,结束时间,绿色圃中小学教育网http:/二,绿色圃中小