苏教版（2014秋）一年级下册数学－第一单元《20以内的退位减法整理和复习》课件 (1)

(共13张PPT)
14-6=
14-8=
11-6=
13-7=
16-7=
18-9=
15-6=
14-9=
12-5=
13-6=
12-8=
14-7=
15-7=
18-8=
17-9=
13-5=
8
8
4
8
11-9
12-9
13-9
14-9
15-9
16-9
17-9
18-9
11-8
13-8
14-8
16-8
17-8
12-7
14-7
16-7
11-6
13-6
15-6
12-5
14-5
11-4
13-4
12-3
11-2
9+2
11-8
11-7
11-6
11-5
11-4
11-3
11-2
11-9
12-8
12-7
12-6
12-5
12-4
12-3
12-9
13-8
13-7
13-6
13-5
13-4
13-9
14-8
14-7
14-6
14-5
14-9
15-8
15-7
15-6
15-9
8+4
7+5
9+3
16-8
16-7
16-9
17-8
17-9
18-9
20以内退位减法表
竖着看，减法算式是怎样排列的？横着看呢
看谁都能算对.
13-9= 15-8= 18-9=
16-7= 16-9= 14-7=
12-3= 14-5= 12-5=
11-8= 15-6= 13-4=
17-9= 11-7= 11-2=
4
7
9
9
7
7
9
9
7
3
9
9
8
4
9
8
8
9
9
+
17
17
17
17
8
8
—
9
9
3
5
10
11
13
9
8
12
3
11
12
6
13
5
13
5
11
2
5
14
11
8
14
—
8
6
8
+
7
15
11
—
5
6
9
1
6
7
8
3