,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,子页,子页,子页,子页,子页题目,内容：,内容：,子页题目,子页,子页,子页,子页,主页,子页,子页题目,子页,子页,子页,主页,子页,T,H,A,N,K,Y,O,U,北师大版 五年级上册 第三单元 倍数与因数,问题,探究,练习,拓展,户县蒋村镇中心小学,唐媛,学习目标：,1,、,了解,2,、,5,的倍数的特征，能判断一个数是否为,2,或,5,的倍数。,2,、,了解奇数，偶数的含义，能判断一个非零自然数是奇数或偶数。,3,、,在观察、猜测和讨论过程中，发展探究问题和解决问题的能力。,1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19,21,22,23,24,26,27,28,29,31,32,33,34,36,37,38,39,41,42,43,44,46,47,48,49,51,52,53,54,56,57,58,59,61,62,63,64,66,67,68,69,71,72,73,74,76,77,78,79,81,82,83,84,86,87,88,89,91,92,93,94,96,97,98,99,5,15,25,35,45,55,65,75,85,95,10,20,30,40,50,60,70,80,90,100,在百数表中圈出,5,的倍数。,你能向同伴解释一下你的发现吗？,5,的倍数的特征：,个位上是,0,或,5,的数，,都是,5,的倍数。,1.,在下面的数中圈出,5,的倍数，并与同伴交流你,是怎么判断的。,1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19,21,22,23,24,26,27,28,29,31,32,33,34,36,37,38,39,41,42,43,44,46,47,48,49,51,52,53,54,56,57,58,59,61,62,63,64,66,67,68,69,71,72,73,74,76,77,78,79,81,82,83,84,86,87,88,89,91,92,93,94,96,97,98,99,5,15,25,35,45,55,65,75,85,95,10,20,30,40,50,60,70,80,90,100,从表中找出,2,的倍数，说一说这些数有什么特征？,2,的倍数特征：,个位上是,2,4,6,8,0,的数，,都是,2,的倍数。,1,2,3,4,6,7,8,9,11,12,13,14,16,17,18,19,21,22,23,24,26,27,28,29,31,32,33,34,36,37,38,39,41,42,43,44,46,47,48,49,51,52,53,54,56,57,58,59,61,62,63,64,66,67,68,69,71,72,73,74,76,77,78,79,81,82,83,84,86,87,88,89,91,92,93,94,96,97,98,99,5,15,25,35,45,55,65,75,85,95,10,20,30,40,50,60,70,80,90,100,观察百数表,既是,2,的倍数又是,5,的倍数有什么特征呢？,个位上是,0,的数,既是,2,的倍数又,是,5,的倍数。,2.,把下列数按要求填入圈内。,2,的倍数,5,的倍数,哪些数既是,2,的倍数，又是,5,的倍数？,像,2,4,6,8,，,这样的数，是,2,的倍数，也叫,像,1,3,5,7,，,这样的数，不是,2,的倍数，也叫,偶数,奇数,巧识妙记,2,5,倍数巧分辨，个位数字是关键。,判断奇数和偶数，,2,的倍数做贡献。,3.,你说我答。,唐老师的电话号码：,138 928 164,5,2,1,、倒数第二个数字是,5,倍数。,2,、,2,、倒数第一个数字是,2,的倍数。,你学到了什么？,