11-9

11-8

11-7

11-6

11-5

11-4

11-3

11-2

12-9

12-8

12-7

12-6

12-5

12-4

12-3

13-9

13-8

13-7

13-6

13-5

13-4

14-9

14-8

14-7

14-6

14-5

15-9

15-8

15-7

15-6

16-9

16-8

16-7

17-9

17-8

18-9

20以内退位减法表

横着看

11

12

13

14

15

16

17

18

11

12

13

14

15

16

17

11

12

13

14

15

16

11

12

13

14

15

11

12

13

14

11

12

13

11

12

11