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,小学数学名师课件,SHUXUE,情境导入,新知探究,巩固练习,课堂小结,情境导入,新知探究,巩固练习,课堂小结,情境导入,新知探究,巩固练习,课堂小结,情境导入,新知探究,巩固练习,课堂小结,认识钟表,北罗小学,一、钟面的认识,钟面圆形,刻度,时针,分针,分针:长而细;时针:短而粗。,2,12,1,3,4,5,6,7,8,9,10,11,有,1,到,12,个数字;,12,个大格,每格一样大。,1,个大格,请你发挥想象,分享你的收获吧?,1,)常见的钟面是圆形;还有,.,2,)有,12,个大小相等的大格;,3,)有,1,到,12,的数字;,4,)有时针和分针;时针短而粗,分针长而细。,二、认识整时,小红是几点起床的?你会认时间吗?,12,11,10,9,8,7,6,5,4,2,1,3,时针和分针分别指向几?,分针指向,12,时针指向,7,7,时,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,5,时,9,时,2,时,分针都指向,12,时针指向不同的数。,分针指着,12,,时针指着几,就是几时。,你知道怎么认识整时的时间了吗?,12,11,10,9,8,7,6,5,4,2,1,3,分针指向,12,时针指向,11,11,时,三、认识电子表,小红起床用了闹钟和电子表,,你认识电子表嘛?,7,:,00,两个零表示整时,这是,7,时。,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,读作:(),写作:(),8:00,3:00,6:00,读作:(),写作:(),读作:(),写作:(),8,时,8:00,3,时,3:00,6,时,6:00,请你用道具时钟拨一拨,拨到,9,时、,4,时、,7,时?,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,说一说小明各个时间在做什么?,9:00,10:00,12:00,6:00,9:00,小明,9,时在做什么?为什么会有两个,9,时?,上午,9,时在看书,晚上,9,时在睡觉,一天有,24,小时。,你了解中国古代的计时方式吗?有何感受?,1,、连一连。,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,12,11,10,9,8,7,6,5,4,2,1,3,2:00,4:00,12:00,9:00,学习到现在,你收获了什么?,1,)钟面、时针、分针的认识;,2,)分针指向,12,,时针指向几就是几时;,3,)会认整时会写整时。,
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