人教版小学一年级数学上册《8和9的加减法》课件
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5+4=9 4+5=9
9-4=5 9-5=4
小组合作
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5+3=8 3+5=8 8-3=5 8-5=3
自主探究
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8、9的加减法
复习导入
2+4=6 1+5=6 3+2=5 4+3=7
6-1=5 6-3=3
2+2=4 7-2=5
情景导入
同学们,快乐的大森林里都有什 么?
我们先来观察小 鹿,你知道了什 么?
一共有9只
百度文库跑走3只
要解决的问题 是“还剩几 只”。
求还剩下几只小鹿,怎 样计算?
求还剩下几只,就是从9 只小鹿里面去掉跑走的3 只小鹿,用减法计算。
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6+2=8 2+6=8 8-2=6 8-6=2
小组合作
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9 - 3 = 6 (只)
树根下有6个,
旁边有2个。
你能提出什 么数学问题 吗?
树根下有6个,
旁边有2个。
你能提出什 么数学问题 吗?
求还剩下几只,怎样计 算?
求还剩下几只,就是从9 只里面去掉跑走的3只, 用减法计算。
9 - 3 = 6 (只)
自主探究
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3+6 8 7-6 2
四、我会算
1. 2.
五、我会看图列式
1.
2.
□5○+□=4□(只9 ) □8○□- =6□(条2 )
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6+3=9 3+6=9 9-3=6 9-6=3
自主探究 想一想
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4+4= 8 8-4=4
你能很快想到哪些算式呢?
5+3=8 3+6=9 4+3=7 2+6=8
4+5=9
你能很快说 出得数吗?
6+3=9 9-3=6 8-4=4
8-2=6
一、我会列算式
1.
2.
二、我会连
1.
2.
三、我会比
(在“○”里填上“>”“<”或“=”)
5+2 8 2+6 8
8-1 9 9-2 6