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,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,*,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,的认识,时与分的认识,秒的认识,12,1,2,3,4,5,6,7,8,9,10,11,1,时,1 00,:,12,1,2,3,4,5,6,7,8,9,10,11,4,时半,12,1,2,3,4,5,6,7,8,9,10,11,6,时,04,分,6,:,04,12,1,2,3,4,5,6,7,8,9,10,11,9,时,58,分,9,:,58,12,1,2,3,4,5,6,7,8,9,10,11,12,时针与分针的关系,填一填,钟面上有,个大格,,个小格。,时针走个大格是,分针走个小格是,时针走个大格,分针正好走,走大格是,时。,分,,圈,,分。,是,分。,1,时,=60,分,12,60,1,1,5,1,60,说一说 、写一写,钟面上的时刻,12,1,2,3,4,5,6,7,8,9,10,11,10,时,15,分,10 15,:,12,1,2,3,4,5,6,7,8,9,10,11,4,时,45,分,4 45,:,12,1,2,3,4,5,6,7,8,9,10,11,6,时,5,分,6 05,:,12,1,2,3,4,5,6,7,8,9,10,11,8,时,55,分,8 55,:,秒的认识,卡盟排行榜,卡盟排行榜,Microsoft Office PowerPoint,,是微软公司的演示文稿软件。用户可以在投影仪或者计算机上进行演示,也可以将演示文稿打印出来,制作成胶片,以便应用到更广泛的领域中。利用,Microsoft Office PowerPoint,不仅可以创建演示文稿,还可以在互联网上召开面对面会议、远程会议或在网上给观众展示演示文稿。,Microsoft Office PowerPoint,做出来的东西叫演示文稿,其格式后缀名为:,ppt,、,pptx,;或者也可以保存为:,pdf,、图片格式等,填空:,1.,秒针从,1,走到,2,是( ),2.,秒针从,3,走到,4,是( ),1.,秒针从,2,走到,6,是( ),1.,秒针从,3,走到,9,是( ),5,秒,5,秒,20,秒,30,秒,12,1,2,3,4,5,6,7,8,9,10,11,分针与秒针的关系,1分=60秒,比一比:,在,20,秒内看看你能写出多少个数字?,1,、,2,、,3,填空,1,时,=,1,时,30,分,=,1,时,10,分,=,80,分,=,分,分,分,分,时,20,70,60,1,90,填一填。,1,分,=,1,分,30,秒,=,1,分,40,秒,=,80,秒,=,分,秒,秒,20,100,60,1,90,秒,秒,体育课练习跑,100,米。小青用了,20,秒,,小东比小青多用,2,秒,小东用了多少,秒?谁跑得快?,20+2=22(秒),答:,小东用了,22,秒。,小青跑得快。,练一练,秒,分,时,小华每天睡,9,,跳绳,20,下用了,10,。,,小亮吃饭用了,15,。,小明跑,100,米用了,25,找家(连一连),时,秒,秒,分,(,1,)时针从,8,走到,9,,经过,1,时。( ),(,5,)在钟面上分针走,1,圈,时针走,1,个小格。,( ),(,4,)在钟面上秒针走,1,圈,分针,走,1,个小格。 ( ),(,3,)秒针从,8,走到,9,,经过,5,时。 ( ),(,2,)分针从,8,走到,9,,经过,1,分。 ( ),正确的画,“,”,,错误的画,“,”,。,让我们试一试,1,分钟能做那些事情,?,再见,
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