人教版一年级数学下册 2.4 整理和复习课件(共12张PPT)

(共12张PPT)
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