2的倍数的特征 (4)

,同,学,们,好,！,第,1,课时,2,的倍数的特征,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,（,2,）哪些是,2,的倍数？把它们圈起来。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,个位上是,0,2,_,的数都是,2,的倍数,4,6,8,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,下面这些数是,2,的倍数吗？,175,2243,700,3375,55578,798,667,336,4006,2,、偶数和奇数的认识,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,整数中，是,2,的倍数的数叫做,偶数,（,0,也是偶数），不是,2,的倍数的数叫做,奇,（,j,）,数,。,偶数：,0,2,4,6,8,10,12,奇数：,1,3,5,7,9,11,13,偶,数：,个,位上是,0,2,4,6,8,的数,奇,数：,个,位上是,1,3,5,7,9,的数,0,是,偶 数,。,偶数：,0,2,4,6,8,10,12,奇数：,1,3,5,7,9,11,13,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,19 357 642 300 567 2221 7009,100 1104 790 998 456 33332,奇 数,偶 数,19,357,567,2221,7009,642,300,100,1104,790,998,456,33332,下面哪些数是,2,的倍数？,24 35 67 90 99 15 106,60 75 130 521 280 6018 8100,2,的倍数有：,24,，,90,，,106,，,60,，,130,，,280,，,6018,，,8100,。,24 35 67 90 99 15 106,60 75 130 521 280 6018 8100,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,归纳小结,个位,上是,0,、,2,、,4,、,6,、,8,的数是,2,的倍数,偶数：个位上是,0,2,4,6,8,的数,奇数：个位上是,1,3,5,7,9,的数,0,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,1,、,一个自然数不是奇数就是偶数。,2,、,偶数都比奇数大。,3,、,个位上是,2,4,6,8,0,的自然数都是偶数。,4,、,一个数是,2,的倍数,，,那它一定是偶数,。,一、下面的说法对吗？说出理由。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,二、填一填。,1.,个位上是（）的数能被,2,整除，能被,2,整除的数叫做（）不能被,2,整除的数叫做（）。,2.,20,以内的所有奇数的和是（）。,3.,三个连续奇数，中间一个是,a,，其它两个数分别是（）和（）。,4.,3,个连续的偶数的和是,60,，这三个数分别是（）（）（）。,0,2,4,6,8,偶数,奇数,100,a,-2,a,+2,18,20,22,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,三、用,0,、,2,、,5,这三个数字组成一个三位数，,使它有因数,2,，这样的数有哪些？,520 502 250,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,思,考,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？,奇数偶数（）,奇数奇数（）,偶数偶数（）,奇数,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,归纳小结,个位,上是,0,、,2,、,4,、,6,、,8,的数是,2,的倍数,偶数：个位上是,0,2,4,6,8,的数,奇数：个位上是,1,3,5,7,9,的数,0,是偶数,1.,课本,P11,-,12,，第,6,题、第,7,题、第,12,题；,2.,完成练习册本课时的习题。,