《时分秒的认识》PPT课件.ppt
时、分、秒,猜谜语,世上有件宝,黄金买不到。一去不复返,愿你珍惜好 。是( ),时间,12,1,2,3,4,5,6,7,8,9,10,11,说说看,钟面上有什么?,11,12,10,1,2,3,4,5,6,9,8,7,11,12,10,1,2,3,4,5,6,9,8,7,1,11,12,10,1,2,3,4,5,6,9,8,7,5,11,12,10,1,2,3,4,5,6,9,8,7,5,10,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,5,10,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,60,1时=60分,圆圆一大家, 兄弟12个 , 各有5个小宝宝 , 60宝宝手牵手,亲亲密密围成圆; 时针爸爸短又粗,懒懒洋洋走大格,一走就是1小时; 分针妈妈细又长,不急不慢走大格,一走就是5分钟; 瞧这一大家,报时可是全靠他。,(12个数字),(1大格里有5小格),(一圈60小格),(1大格是1小时),(1小格是1分钟,1大格是5分钟),时针与分针的关系,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=( ),12,60,1,1,5,1,60,60分,想想做做 1分钟脉搏大约跳( 70)次。 1分钟大约做( 1)节眼保健操。 1分钟大约跳(60)下绳。,下面的计算,你能在1分钟内完成吗? 97= 459= 25+9= 284= 76= 213= 39= 546= 42-8=,63,5,34,7,42,7,27,9,34,一节课是( )分钟,课间休息( ) 分钟,再加上( )分钟是1小时。,40,10,10,总结: 通过这节课的学习,你有什么收获?,“时间就是生命,时间就是速度,时间就是 力量” 鲁迅,