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人教2011课标版小学数学一年级下册《2.20以内的退位减法 整理和复*》公开课PPT课件_45

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20以内的退位减法 整理和复*

13-8

11-7 15-7

14-9

14-5

15-8

17-8

13-7

12-6

16-7 11-9

12-9 14-6

15-9 12-5

18-9
14-8 11-5

11-4 12-3
16-8

12-8

14-7

15-6 11-8 13-9

13-4

13-5

11-6 16-9 17-9

12-4

12-7

13-6

11-2

11-3

11-99 1=2-9 11-88 1=23-8 11-77 1=24-7 11-6 1=25-6 11-55 1=26-5 11-4 1=27-4 11-33 1=28-3 11-22 =9

20以内退位减法表

11-99 12-9 13-9 14-9 15-9 16-9 17-9 18-9

11-88 12-8 13-8 14-8 15-8 16-8 17-8

11-77 12-7 13-7 14-7 15-7 16-7

11-6 12-6 13-6 14-6 15-6

11-55 12-5 13-5 14-5

11-4 12-4 13-4

11-33 12-3

竖着看

11-22

20以内退位减法表

11-99 12-9 13-9 14-9 15-9 16-9 17-9 18-9 11-88 12-8 13-8 14-8 15-8 16-8 17-8 11-77 12-7 13-7 14-7 15-7 16-7

11-66 12-6 13-6 14-6 15-6 11-55 12-5 13-5 14-5 11-44 12-4 13-4 11-33 12-3 11-22

横着看

20以内退位减法表

11-9 12-9 13-9 14-9 15-9 16-9 17-9 18-9 11-8 12-8 13-8 14-8 15-8 16-8 17-8 11-7 12-7 13-7 14-7 15-7 16-7

11-6 12-6 13-6 14-6 15-6 11-55 12-5 13-5 14-5 11-44 12-4 13-4 11-3 12-3 11-22

斜着看

20以内退位减法表
11-9 12-9 13-9 14-9 15-9 16-9 17-9 18-9 11-8 12-8 13-8 14-8 15-8 16-8 17-8 11-7 12-7 13-7 14-7 15-7 16-7 11-6 12-6 13-6 14-6 15-6 11-5 12-5 13-5 14-5 11-4 12-4 13-4 11-3 12-3 11-2

12-8 13-8 14-8 15-8 16-8

12-7

15-7

12-6 12-5 13-5

15-6

13-6

13-7

14-6 14-7

摘果子
12 - 3 = 9

13 - 8 = 5

13 - 6 = 7

11 - 8 = 3

15 - 7 = 8

8 11-3

16-8

2

13-5 15-7

3

12-4

4

5

17-9

14-6

6

7

作业:
观察第23页的20以内退位减法 表,和我们整理的有什么不同?请 你找出排列的规律。




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