第二单元十几减5、4、3、2（二）(1)（课件）人教版一年级下册数学(共17张PPT)

(共17张PPT)
第二单元 20以内的退位减法
第9 课时
十几减5 、4 、3 、2 （ 二）
能准确地口算十几减5、4、3、2的退位减法，会进行简单的计算。
学习目标
课前准备
11-5 11-4 11-3 11-2
12-5 12-4 12-3
13-5 13-4
14-5
打地鼠
11-5
11-5=6
11-4
67
11-4=7
10 - 5 = 5
5 + 1 = 6
4+ 7 = 11
11- 4 = 7
11-3
11-3=8
11-2
89
11-2=9
11-5 =6
11-4 =7
11-3 =8
11-2 =9
11-5 11-4 11-3 11-2
12-5 12-4 12-3
13-5 13-4
14-5
=
=
=
5
7
小女孩吹泡泡
4
3
12-
8
9
5+ 7 = 12
12- 5 = 7
12-5
12-4
12-3
13-5
13-4
14-5
11-5 =6
11-5 =6 11-4 =7 11-3 =8 11-2 =9
12-5 =7 12-4 =8 12-3 =9
13-5 =8 13-4 =9
14-5 =9
11-5 =6
12-5
12-4
12-3
13-5
14-5
12-5 =7
13-5 =8
14-5 =9
12-5
13-5
+1
+1
+1
11-5 =6 11-4 =7 11-3 =8 11-2 =9
12-5 =7 12-4 =8 12-3 =9
14-5 =9
+1
13-5 =8 13+-14 =9
+1
13-4
1.小动物们应该上哪节车厢呢？
13-5 12-6 14-5
15-8
6
9
8
7
11-3=8
13-5=12
2.哪把锁坏了？
14-5=8
14-5=9
13-5=8
7 8 9 10 11 12
1 2 3 4 5 6
3.停车场里停了12辆车， 开走了 辆
还剩几辆？
12-2
12-4
12-1
12-3
12-5
12-5 = 7
12-4 = 8
12-2 =10
12-3 = 9
12-1 =11
2 - 1 = 1
1 + 10 = 11
10 - 3 = 7
7 + 2 = 9
12-1 =11
12-2 =10
12-3 = 9
12-4 = 8
12-5 = 7
读一读，记一记。