数学人教版五年级下册2、5的倍数的特征.pptx

1、2、5的倍数的特征,汇星学校 鄢丽玉,座位号是多少的同学 应该从双号入口进?,座位号为 2，4， 6，8，10，,这些数都是 2 的倍数。,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,25,29,21,22,23,24,26,27,28,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80

2、,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,你发现了什么？,2,4,6,8,10,12,14,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,2,2,2,2,2,2,2,2,2,2,16,6,4,4,4,4,4,4,4,4,4,4,6,6,6,6,6,6,6,6,6,8,8,8,8,8,8,8,8,8,8,0,0

3、,0,0,0,0,0,0,0,0,个位上是 0，2， 的数都是 2 的倍数。,4，6，8,自然数中，是 2 的倍数的数叫做偶数，不是 2 的倍数的数叫做奇数。,看谁能把果实又快又准地装进袋子里？,7,18,74,46,偶数,奇数,91,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64

4、,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,你发现了什么？,5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100,5,5,5,5,5,5,5,5,5,5,0,0,0,0,0,0,0,0,0,0,个位上是0或5的数它是的倍数。,哪些数是5的倍数？把它们圈起来。,42,70,98,45,19,5,个位上是0或5的数都是5的倍数。,按要求填一填。,2的倍数,5的倍数,60,30,30,24 30 35 40 12 15 60 18 72 85 90,40,12,18,72,90,24,35,40,15,60,85,90,仔细观察2、5的倍数，你发现了什么？,30,40,60,90,30,40,6