一年级数学下册教学课件-2整理和复习-人教版 (19) 11页

整理和复习 3 4 6 7 8 15-9 11-4 一、创设情境 11-9 12-9 13-9 14-9 15-9 16-9 17-9 18-9 =2 =3 =4 =5 =6 =7 =8 =9 减数不变，被减数越大，差越大 。 11-8 11-7 11-6 11-5 11-4 11-3 11-2 = 3 = 4 = 5 = 6 = 7 = 8 = 9 被减数不变，减数越小，差越大。 二、自主探究 11-9 12-9 13-9 14-9 15-9 16-9 17-9 18-9 =2 =3 =4 =5 =6 =7 =8 =9 11-8 11-7 11-6 11-5 11-4 11-3 11-2 = 3 = 4 = 5 = 6 = 7 = 8 = 9 12-8 13-8 14-8 15-8 16-8 17-8 12-7 13-7 14-7 15-7 16-7 12-6 13-6 14-6 15-6 12-5 13-5 14-5 12-4 13-4 12-3 = 9 = 9 = 9 = 9 = 9 = 9 = 8 = 8 = 8 = 8 = 8 被减数、减数依次增加 1 ，差不变。 二、自主探究 11-9 12-9 13-9 14-9 15-9 16-9 17-9 18-9 =2 =3 =4 =5 =6 =7 =8 =9 11-8 11-7 11-6 11-5 11-4 11-3 11-2 = 3 = 4 = 5 = 6 = 7 = 8 = 9 12-8 13-8 14-8 15-8 16-8 17-8 12-7 13-7 14-7 15-7 16-7 12-6 13-6 14-6 15-6 12-5 13-5 14-5 12-4 13-4 12-3 =4 = 9 = 9 = 9 = 9 = 9 = 9 = 8 = 8 = 8 = 8 = 8 = 7 = 7 = 7 = 7 = 6 = 6 = 6 = 5 = 5 二、自主探究 12 － 9 3 朵 三、解决问题 （一）夺红旗 3 6 6 6 5 5 5 5 激情大冲关 （二）看图列式 5 11 个 6 4 13 支 9 激情大冲关 14 － 8 6 只 （三）解决问题 1. 激情大冲关 （三）解决问题 16 － 9 ＝ 7 （棵） 2 、下面是育英学校今年植树的棵数。 9 棵 16 棵 5 棵 比 多几棵？ 激情大冲关 谢 谢