(共24张PPT)
整理和复习
17-9=
14-8=
14-5=
13-6=
11-9=
11-8=
18-9=
15-9=
11-3=
12-7=
16-7=
13-9=
一、口算抢答。
9
8
6
5
7
6
9
2
9
8
4
3
二、整理20以内退位减法
12-7
13-7
14-7
15-7
16-7
12-6
13-6
14-6
15-6
12-5
14-5
12-4
13-4
12-3
12-8
13-8
15-8
16-8
17-8
14-8
13-5
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
+1
三、观察退位减法表:竖看
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12-9=3
14-9=5
16-9=7
15-9=6
17-9=8
18-9=9
13-9=4
11-9=2
12-8=4
12-7=5
12-6=6
12-5=7
12-4=8
12-3=9
13-8=5
13-7=6
13-6=7
13-5=8
13-4=9
14-8=6
14-7=7
14-6=8
14-5=9
15-8=7
15-7=8
15-6=9
16-8=8
16-7=9
17-8=9
11-8=3
11-6=5
11-7=4
11-5=6
11-4=7
11-3=8
11-2=9
四、你信吗?“我会变”
12 - 9 3 朵
1.
四、学以致用,解决问题
谢 谢