二年级数学下册七《时、分、秒》1奥运开幕课件2北师大版.ppt

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1、猜谜语,溜溜圆上,两根针。一根长,一根短,滴答滴答转圈圈(打一物品),谜底:钟表,12,11,10,9,8,7,6,5,4,3,2,1,8:00,12,11,10,9,8,7,6,5,4,3,2,1,8:30,北京时间2008年 8月8日晚8时08分,北京奥运会在国家体育馆开幕。,钟面上有( )个大格,( )个小格,时针走1大格是( )时,分针走一小格是( )分走一大格是( )分,时针走1大格,分针正好走( )圈,1时,60分,12,60,1,1,5,1,12,11,10,9,8,7,6,5,4,3,2,1,5,10,15,20,25,30,35,40,45,50,55,60,格,大格,小格,

2、钟面上有( )个大格,( )个小格,时针走1大格是( )时,分针走一小格是( )分走一大格是( )分,时针走1大格,分针正好走( )圈,1时,60分,12,60,1,1,5,1,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,3,2,1,5,10,15,20,25,30,35,40,45,50,55,60,12,11,10,9,8,7,6,5,4,3,2,1,分针走了几分?,12,11,10,9,8,7,6,5,4,3,2,1,12,11,10,9,8,7,6,5,4,3,2,1,12,11,10,9,8,7,6,5,4,3,2,1,钟面上有(

3、)个大格,( )个小格,时针走1大格是( )时,分针走一小格是( )分走一大格是( )分,时针走1大格,分针正好走( )圈,1时,60分,12,60,1,1,5,1,12,11,10,9,8,7,6,5,4,3,2,1,12,11,10,9,8,7,6,5,4,3,2,1,9 时,9 : 00,9时08分,9 : 0 8,你能总结出认读几时几分的方法吗?,顺口溜: 小小表盘圆又圆,时针分针跑圈圈。分针长,时针短,一个快来一个慢。 分针跑完一大圈,时针刚跑一小段。时针走过数字几,表示时间几时多。 要问多了几分钟,请你仔细看分针。分针走过几小格,就是多了多少分。,7时45分 7:00,9时05分

4、9 : 05,10时25分 10 : 25,3时25分 3 : 25,时针不停的转动,时间也就悄悄地溜走了,而且再也回不来了。因此我们要学习淘气,从小就要做一个会安排时间并且爱珍惜时间的孩子。,亲爱的同学们:,思考题,几时整时针和分针在一条线上?,几时整时针和分针组成直角?,几时整时针和分针重合?,你学到了什么?,珍惜时间,合理安排时间,做时间的小主人。,猜谜语,滴答滴答,滴答滴答,会走没有退,会说没有嘴,它会告诉我们,什么时候起,什么时候睡。(打一物品),谜底:钟表,5、猜谜语。,公鸡喔喔催天明,大地睡醒闹盈盈。长针短针成一线,请问此刻是几时?(打一时刻),谜底:6时,思考题:,认一认:,9,:,00,9:08,9:30,9:45,

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