《认识时间》(几时几分).ppt
认识时间,执教:唐玉琼,人教版二年级数学上册,宣威市虹桥小学,第二课时,钟面上有()个大格,()个小格,长长的针是()针,短短的针是()针。,12,60,时,分,1小时,1分,时针走一大格是()分针走一小格是(),分针从12走到1是()分,5,分针从12走到6是()分,30,分针从12走到9是()分,45,复习,钟面上有 根针,长针叫,短针叫。,两,分针,时针,钟面上有 个数字,有 个大格,有 个小格。,12,12,60,分针走一小格是 分,走一大格是 分,走一圈是 分。,1,5,60,时针走一大格是 时,走一圈是 时。,1,12,分针走一圈是 分,时针正好走一个大格,是 时。,60,1,1,2,3,4,5,7,6,8,11,12,10,9,5,分针走1大格是5分,走2大格是10分,走3大格,用5的乘法口诀算几分,1,2,3,4,5,7,6,8,11,12,10,9,5,10,15,20,25,30,35,40,45,50,55,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时 5分,4:05,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时30分或4时半,4:30,11,12,10,1,3,4,5,6,9,8,7,2,从四时开始数。,4时45分,4:45,我们看几时几分,要先看时针,时针走过数字几,就是几时。再看分针从12起走了几个小格就是几分,合起来就是几时几分。,用电子表的形式表示时间时,如果表示分钟的数不到10,要在表示分钟的数的前面加一个0。,小结:,11,12,10,1,3,4,5,6,9,8,7,5,9时 5分,9:05,11,12,10,1,2,3,4,5,6,9,8,7,5,10,15,20,25,6时25分,6:25,9时15分9:15,11时55分11:55,认一认,考考你,相信你一定行!,3:10,7:15,1:20,2:40,10:45,5:25,6:50,8:55,谁最棒?,715,120,525,845,1150,855,730,740,800,120,1045,955,605,930,640,935,一寸光阴一寸金,寸金难买寸光阴。,请珍惜每一分,让生命更有价值!,3,明明9:00做完作业后去踢球,10:30还要去看木偶剧,他可能在哪个时间去踢球?,A、7:45,B、9:15,C、10:50,(),(),(),谢 谢 指 导,