《十几减几》课件

《《十几减几》课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、十几减几引入引入:15–9=口算17–9=11–9=13–9=19–9=682410新授探究一探究二探究一:探究一探究二13–8=5想：8+(5)=1313–8=5想：10–8=22+(3)=5探究一探究二探究二:1、口算。16–8=11–8=15–8=15–7=8378探究一探究二11–6=16–7=11–5=16–9=5967探究二:２、口答练习。探究一探究二11–6=16–7=11–5=16–9=59676579探究二:２、口答练习。探究一探究二11–6=16–7=11–5=16–9=59676677探究二:２、口答练习。探究一探究二11–6=16

2、–7=11–5=16–9=59675599探究二:２、口答练习。探究一探究二３、看谁看得又快又好。探究二:12–3=13–7=12–9=13–6=963712–5=16–8=12–7=14–7=7857练习练习一练习二练习一练习二练习一:1、看图列式计算。练习一练习二练习一:1、看图列式计算。48486767练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=74练习一练习二练习

3、一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=13–9=7944练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=13–9=14–6=796448练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=13–9=14–6=12–6=79664486练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=

4、13–9=14–6=12–6=11–8=7986644386练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=13–9=14–6=12–6=11–8=13–6=798666443786练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8=14–7=11–7=13–9=14–6=12–6=11–8=13–6=17–9=79866694437868练习一练习二练习一:2、口算。11–4=13–4=11–3=13–7=14–8=12–6=17–8

5、=14–7=11–7=13–9=14–6=12–6=11–8=13–6=17–9=14–7=7986669744378687练习一练习二练习二:练习一练习二13只苹果，其中红苹果有8只，绿苹果有几只？练习二:练习一练习二练习二:13只苹果，其中红苹果有8只，绿苹果有几只？练习一练习二练习二:13只苹果，其中红苹果有8只，绿苹果有几只？13–8=5(只)练习一练习二练习二:13只苹果，其中红苹果有8只，绿苹果有几只？13只苹果，其中绿苹果有5只，红苹果有几只？13–8=5(只)练习一练习二练习二:13只苹果，其中红苹果有8只，绿苹果有几只？13只苹果，其中

6、绿苹果有5只，红苹果有几只？13–8=5(只)13–5=8(只)小结:今天这节课我们学习了《十几减几》，知道计算十几减几仍可以采用“想加算减”的方法和“破十减的方法”；还知道了一道减法算式可以改写成另一道对应的减法算式。这样的思想也能帮助我们计算十几减几。作业：