小学数学二年级认识时间公开课.ppt

认识时间,二年级上册,你能说出钟面上的时间吗？,3,3：00,（）时,分针,时针,12,3,3：00,9：00,6：00,12：00,分针指着12，时针指着几就是几时,3,4,5,6,7,8,9,10,11,12,2,钟面上有（）个大格,12,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,(),1,2,3,4,(),每个大格里有（）个小格,5,1,2,3,4,5,7,6,8,11,12,10,9,5,10,25,30,20,15,60,35,40,45,50,55,每个大格里有（5）个小格,一共有（60）个小格,11,12,10,1,2,3,4,5,6,9,8,7,时针走1大格是1小时,11,12,10,1,2,3,4,5,6,9,8,7,1,分针走1小格是1分。,11,12,10,1,2,3,4,5,6,9,8,7,5,分针走1大格是5分。,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,半小时,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,60,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,30,35,40,45,50,55,60,12,1,2,3,4,5,6,7,8,9,10,11,1分钟有多长呢？,1,2,3,4,5,7,6,8,11,12,10,9,1时=60分,时针走一个大格，分针走一圈。,11,12,10,1,2,3,4,5,6,9,8,7,12：00,11,12,10,1,2,3,4,5,6,9,8,7,1：00,11,12,10,1,2,3,4,5,6,9,8,7,1：多,11,12,10,1,2,3,4,5,6,9,8,7,1：多,11,12,10,1,2,3,4,5,6,9,8,7,1：多,11,12,10,1,2,3,4,5,6,9,8,7,2：00,11,12,10,1,2,3,4,5,6,9,8,7,4：00,11,12,10,1,2,3,4,5,6,9,8,7,4：多,11,12,10,1,2,3,4,5,6,9,8,7,4：多,11,12,10,1,2,3,4,5,6,9,8,7,5：00,11,12,10,1,2,3,4,5,6,9,8,7,9：00,11,12,10,1,2,3,4,5,6,9,8,7,9：多,11,12,10,1,2,3,4,5,6,9,8,7,11,12,10,1,2,3,4,5,6,9,8,7,11：多,11,12,10,1,2,3,4,5,6,9,8,7,12：00,11,12,10,1,2,3,4,5,6,9,8,7,11,12,10,1,2,3,4,5,6,9,8,7,11,12,10,1,2,3,4,5,6,9,8,7,5,4时,4：05,5分,11,12,10,1,2,3,4,5,6,9,8,7,5,4：15,10,15,11,12,10,1,2,3,4,5,6,9,8,7,5,4：30,10,30,20,25,15,4时半,11,12,10,1,2,3,4,5,6,9,8,7,5,4：45,10,30,20,25,15,35,40,45,11,12,10,1,2,3,4,5,6,9,8,7,4：55,45,50,55,11,12,10,1,2,3,4,5,6,9,8,7,