人教版五年级下册数学第二单元---第7课时-奇偶性课件

,第,2,课时 奇偶性,R,五年级下册,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,第 2 课时 奇偶性R五年级下册状元成才路状元成才路状,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,奇数,把下面各数分别填在合适的圈内。,39 48 51 207 420 801 8976,偶数,51,39,207,801,48,420,8976,说说你是怎么判断的？,复习回顾,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,奇数与偶数的和是奇数还是偶数？奇数与奇数的和是奇数还是偶数？偶数与偶数的和呢？,阅读与理解,题目让我们对奇数、偶数的和做一些探索。,从题目中你知道了什么？,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,我把问题表示成这样,奇数,+,偶数,=,奇数？,偶数？,奇数,+,奇数,=,奇数？,偶数？,偶数,+,偶数,=,奇数？,偶数？,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,分析与解答,我随便找几个奇数、偶数，加起来看一看。,5,7,12,7,9,16,5,8,13,7,8,15,8,12,20,12,24,36,奇数奇数,偶数,奇数偶数,奇数,偶数偶数,偶数,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,奇数：,偶数：,除以,2,余,1,除以,2,余,0,（没有余数）,用图表示看起来更方便。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,奇数：,偶数：,奇数,+,偶数：,除以,2,余,1,所以，,奇数偶数奇数,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,奇数：,奇数,+,奇数：,除以,2,余,0,所以，,奇数奇数偶数,奇数：,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,偶数：,偶数：,偶数,+,偶数：,除以,2,余,0,所以，,偶数偶数偶数,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,回顾与反思,我可以再找一些大数试一试。,这个结论正确吗？,123,222,345,319,534,853,325,127,452,533,317,850,434,318,752,620,312,932,奇数偶数奇数,奇数奇数偶数,偶数偶数偶数,所以，以上结论正确！,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,30,个学生要分成甲、乙两队。如果甲队人数为奇数，乙队人数为奇数还是偶数？如果甲队人数为偶数呢？,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,30,是偶数，甲队人数为奇数，奇数奇数偶数，所以，乙队人数是奇数。,30,是偶数，甲队人数是偶数，偶数偶数偶数，所以，乙队人数是偶数。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,试一试,偶数,+,偶数,+,偶数,偶数,+,偶数,+,偶数,+,偶数,偶数,+,偶数,+,+,偶数,偶数,偶数,偶数,结论：,无论多少个偶数相加的和都是偶数。,试一试偶数+偶数+偶数偶数+偶数+偶数+偶数偶数+偶数+,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,试一试,奇数,+,奇数,+,奇数,奇数,+,奇数,+,奇数,+,奇数,奇数,+,奇数,+,奇数,+,奇数,+,奇数,奇数,偶数,奇数,10,个奇数相加的和,偶数,结论：,奇数个奇数相加的和是奇数。,偶数个奇数相加的和是偶数。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,6,个奇数,+7,个偶数,7,个奇数,+8,个偶数,100,个奇数,+100,个偶数,偶数,奇数,偶数,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,知识运用,1.,把,10,个足球分成三组，要求每组球的个数是,奇数,，怎样分？,奇数,+,奇数,+,奇数,奇数,10,是偶数，所以不能分。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2.,把,11,个苹果分给三个小朋友，要求每个小朋友分得,偶数,个苹果，怎样分？,偶数,+,偶数,+,偶数,偶数,11,是奇数，所以不能分。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,3.,小华买了,1,支铅笔、,2,块橡皮、,2,个练习本，付了,10,元钱，售货员找给他,5,角钱。小华看了看,1,支铅笔的价钱是,8,角钱，就说：“叔叔，您把账算错啦！”,小华为什么这么快就知道账算错了？,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,偶数,+,偶数,+,偶数,偶数,一支铅笔,两块橡皮,两个练习本,10,元,100,角，也是个偶数，售货员找回的钱数也应该是个偶数，可,5,是个奇数。,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,4.,奇数与奇数的积是奇数还是偶数？奇数与偶数的积是奇数还是偶数？偶数与偶数的积呢？,57,35,79,63,58,40,78,56,812,96,1424,336,奇数,奇数奇数,奇数,偶数偶数,偶数,偶数偶数,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,人教版五年级下册数学第二单元-第7课时-奇偶性课件,课后作业,1.,课本,P17,，第,4,题；,2.,完成练习册本课时的习题。,课后作业1.课本P17，第4题；,