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猜一猜,我有一个好朋友,嘀嗒嘀嗒不停走,叫我学习和休息,真是我的好帮手。,认识时间,R,二年级上册,认识时间,新课导入,9,时,你能告诉大家这个钟面上的时刻是多少吗?,新知探究,钟面上有,12,个数,每相邻的两个数中间有一个大格,一共有,12,个大格,。,12,1,2,3,4,5,6,7,8,9,10,11,每大格有,5,个小格,认识“分”,一共有,60,个小格,12,1,2,3,4,5,6,7,8,9,10,11,1,分,2,分,3,分,4,分,5,分,分针走,1,小格是,1,分。,分针走,1,大格,是,_,分,5,12,1,2,3,4,5,6,7,8,9,10,11,5,(),(),(),(),(),(),(),(),(),(),数一数,填一填。,15,10,20,25,30,35,40,45,50,55,60,拨一拨。,12:00,12:30,1:00,1,时,=60,分,30,分也可以说成半小时。,认识几时几分,从,4,时开始数。,10,20,25,30,35,40,45,50,55,60,(),(),5,15,4:05,4,时,5,分,4:30,4,时,30,分,4:45,4,时,45,分,【,教材,P91,例,2】,认识几时几分,4:05,4:30,4:45,时针走过数字,4,,分针从,12,起走了多少个小格,就是,4,时多少分。,4,时,5,分,4,时,30,分,4,时,45,分,认识几时几分,7:30,7:40,8:00,10:45,9:55,6:05,1:20,【,教材,P91,做一做,】,巩固练习,深化理解,9:30,6:40,9:10,【,教材,P93,练习二十三 第,1,题,】,1.,填空。,2.,连线。,【,教材,P93,练习二十三,第,2,题,】,认识时间,分针走,1,小格是,1,分,时针走,1,大格是,1,时。,1,时,=60,分,30,分也可以说成半小时,写时间时:如果分针数不到,10,,要在表示分针的数的前面加,0,。,课堂小结,畅谈收获,1.时针走1大格是()时,走1圈是()时。,2.分针走1小格是()分,走1大格是()分,走1圈是()分。,3.30分也可以说成()小时。,一、填一填。,1,12,1,5,60,半,【,选自,创优作业,100,分,】,巩固练习,4.时针从12走到5,走了()时;时针从6走到11,走了,()时;分针从12走到7,走了()分;分针从4走到10,走了()分。,5.右面钟面上的时间是(),再过半小时就要开始播走近科学节目,走近科学的播出时间是()。,5,5,35,30,7:30,8:00,二、连一连。,【,选自,创优作业,100,分,】,三,、下面哪个是李阿姨所乘列车的出发时间?在()里画“”。,【,选自,创优作业,100,分,】,四、,想一想、填一填。,(,1,),钟面上有(,)个大格,(,)个小格。,(,2,),时钟走,1,大格是(,)时,走一圈是(,)时。,(,3,),分针走,1,小格是(,)分,走,1,大格是(,)分。,(,4,),分针从,12,走到,9,,走了(,)分。,(,5,),时针从,12,走到,4,,走了(,)时,。,12,60,1,12,1,5,45,4,五、,照样子认一认,写一写。,3:45,3,时,45,分,_,:,_,_,时,_,分,_,:,_,_,时半,6,05,5,6,7,30,7,六、,看钟表想一想,写一写。,过,20,分钟是,_,过,35,分钟是,_,7,时,25,分,8,时,50,分,七、,写出相应的时间并在钟面上画出缺少的分针。,7:00,7:05,2:25,2:45,
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