24时计时法.ppt
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1、执 教:孙红杰,人教版三年级数学下册第四单元,学习目标,1、知道1日=24时,理解24时计时法。2、理解24时计时法与普通计时法的联系与 区别。3、能正确运用这两种计时法表示时刻,并会相互转化。,12,9,1,8,7,6,4,3,2,5,11,10,0,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,
2、6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,12,9,1,8,7,6,4,3,2,5,11,10,13,12,9,1,8,7,6,4,3,2,5,13,11,10,12,9,1,8,7,6,4,3,2,5,13,11,10,14,12,9,1,8,7,6,4,3,2,5,13,11,10
3、,14,12,9,1,8,7,6,4,3,2,5,13,11,10,14,15,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,18,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,15,18,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15,18,17,12,9,1,8,7,6,4,3,2,5,13,11,10,14,16,19,15
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