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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,时、分、秒,时间单位的换算,1,时()分,1,分,()秒,60,60,填一填。,一、复习旧知,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,60,60,60,60,24,0,4,分,()秒,240,120,秒,()分,2,60,秒是,1,分,,120,秒是,2,个,60,秒。,1,分是,60,秒,,4,分就是,4,个,60,秒。,二、探究新知,5,时,()分,300,可以想,,1,时是,60,分,,5,时里有,几个,1,时,就是几个,60,分。,二、探究新知,三、知识运用,1.,填一填。,3,时,()分,3,分,()秒,150,秒,30,秒,()分,1,时,25,分,()分,180,180,85,2,(,1,),50,分比,1,时少()分,1,分比,45,秒多()秒,(,2,)一节课是()分,课间休息()分,再加()分就是,1,时。,(,3,),9,分,90,秒,2.,在 里填上,“,”“,”,或,“,”,。,3,时,200,分,1,分,15,秒,65,秒,1,时,30,分,90,分,3.,选一选,。,三、知识运用,4,时,()分,A.400 B.240,C.140,2,分,20,秒,()秒,A.220 B.120,C.140,300,秒,()分,A.3 B.30,C.5,B,C,C,三、知识运用,4.,填上合适的时间单位,(,1,)跳绳,60,下大约要,30,(),(,2,)小学生每天睡眠时间为,9,(),(,3,)烧开一锅水大约,10,(),四、布置作业,作业:,第,4,页例,1,“,做一做”。,第,7,页练习一,第,5,题、第,6,题。,
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