一年级上册数学课件-9.2 不退位减法 ▏冀教版(2014秋) (共31张PPT).ppt

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1、15 15 9 = 9 =口算口算17 17 9 = 9 =11 11 9 = 9 =13 13 9 = 9 =19 19 9 = 9 =6 68 82 24 41010探究一探究一探究二探究二探究一探究一探究二探究二13 13 8 = 8 =5 5想：想：8 + ( 5 ) = 13 13 8 = 5想：想：10 8 = 2 2 + ( 3 ) = 5探究一探究一探究二探究二1、口算。、口算。16 16 8 = 8 =11 11 8 = 8 =15 15 8 = 8 =15 15 7 = 7 =8 83 37 78 8探究一探究一探究二探究二11 11 6 = 6 =16 16 7 = 7

2、=11 11 5 = 5 =16 16 9 = 9 =5 59 96 67 7、口答练习。、口答练习。探究一探究一探究二探究二11 11 6 = 6 =16 16 7 = 7 =11 11 5 = 5 =16 16 9 = 9 =5 59 96 67 76 65 57 79 9、口答练习。、口答练习。探究一探究一探究二探究二11 11 6 = 6 =16 16 7 = 7 =11 11 5 = 5 =16 16 9 = 9 =5 59 96 67 76 66 67 77 7、口答练习。、口答练习。探究一探究一探究二探究二11 11 6 = 6 =16 16 7 = 7 =11 11 5 = 5

3、 =16 16 9 = 9 =5 59 96 67 75 55 59 99 9、口答练习。、口答练习。探究一探究一探究二探究二、看谁看得又快又好。、看谁看得又快又好。12 12 3 = 3 =13 13 7 = 7 =12 12 9 = 9 =13 13 6 = 6 =9 96 63 37 712 12 5 = 5 =16 16 8 = 8 =12 12 7 = 7 =14 14 7 = 7 =7 78 85 57 7练习一练习一练习二练习二练习一练习一练习二练习二1、看图列式计算。、看图列式计算。练习一练习一练习二练习二1、看图列式计算。、看图列式计算。4 48 84 48 86 67 76

4、 67 7练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =7 74 4练习一练习一练习二练习二2、口算。、口算。11 11

5、 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =7 79 94 44 4练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 = 6

6、=7 79 96 64 44 48 8练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 = 6 =12 12 6 = 6 =7 79 96 66 64 44 48 86 6练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8

7、 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 = 6 =12 12 6 = 6 =11 11 8 = 8 =7 79 98 86 66 64 44 43 38 86 6练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 =

8、 6 =12 12 6 = 6 =11 11 8 = 8 =13 13 6 = 6 =7 79 98 86 66 66 64 44 43 37 78 86 6练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 = 6 =12 12 6 = 6 =11 11 8 = 8 =13 13 6 = 6 =17 17 9 = 9 =7 79

9、98 86 66 66 69 94 44 43 37 78 86 68 8练习一练习一练习二练习二2、口算。、口算。11 11 4 = 4 =13 13 4 = 4 =11 11 3 = 3 =13 13 7 = 7 =14 14 8 = 8 =12 12 6 = 6 =17 17 8 = 8 =14 14 7 = 7 =11 11 7 = 7 =13 13 9 = 9 =14 14 6 = 6 =12 12 6 = 6 =11 11 8 = 8 =13 13 6 = 6 =17 17 9 = 9 =14 14 7 = 7 =7 79 98 86 66 66 69 97 74 44 43 37

10、 78 86 68 87 7练习一练习一练习二练习二练习一练习一练习二练习二13只苹果，其中红苹果有只苹果，其中红苹果有8只，绿苹果有几只？只，绿苹果有几只？练习一练习一练习二练习二13只苹果，其中红苹果有只苹果，其中红苹果有8只，绿苹果有几只？只，绿苹果有几只？练习一练习一练习二练习二13只苹果，其中红苹果有只苹果，其中红苹果有8只，绿苹果有几只？只，绿苹果有几只？13 13 8 = 5( 8 = 5(只只) )练习一练习一练习二练习二13只苹果，其中红苹果有只苹果，其中红苹果有8只，绿苹果有几只？只，绿苹果有几只？13只苹果，其中绿苹果有只苹果，其中绿苹果有5只，红苹果有几只？只，红苹果有几只？13 13 8 = 5( 8 = 5(只只) )练习一练习一练习二练习二13只苹果，其中红苹果有只苹果，其中红苹果有8只，绿苹果有几只？只，绿苹果有几只？13只苹果，其中绿苹果有只苹果，其中绿苹果有5只，红苹果有几只？只，红苹果有几只？13 13 8 = 5( 8 = 5(只只) )13 13 5 = 8( 5 = 8(只只) )