新人教版二年级数学上册《连加、连减和加减混合》教学课件
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70 -2 3
47
47 -28
19
注意对齐数位哦!
70 -2 3
47 -2 8
19
导入新课 说一说你发现了哪些数学信息?
初步感知
如何计算,请你 试一试。
先算第一组、第二组一共摘的南瓜:
28+34= 62(个)
再加上第三组摘的南瓜:
口答:一共摘了84个南瓜。
62+22=84(个)
初步感知
你能列出综 竖请式你合怎试算么一式算试吗?。?
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28+34+22=
Biblioteka Baidu
深入探究
28+34+22= 84
28 +34
1 62
62 +22
84
深入探究
28+34+22=84
能不能把它们合 在一起写呢?
28 +34
1 62 +22
84
这样简便了。
深入探究
28+34+22= 84
还可以:
28
3 4 10 +22
1 84
深入探究 说说哪种写法适合你。
深入探究
02
掌握用竖式计算连加、连减的方法和简便写法,进一步巩 固两位数加、减两位数,能灵活、正确的计算连加、连减 的题目。
培养正确计算的能力和迁移的能力,发展解决简单 实际问题的意识和能力。
03 培养认真、仔细的良好学习习惯。
自主学习反馈
请把下列两个相加的竖式合并成一个。
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连加、连减和加减混合
二年级上册
本节目标
01
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84-40-26=18(个)
84 -4 0
84-40=44能口算,可以不写竖式。
44 -2 6
18
口答:还剩18个。
深入探究
共有84个大南瓜,李大爷运走了40个,王叔叔运走了
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26个。还剩多少个? PPT素材:www.1ppt.com/sucai/
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共有84个大南瓜,李大爷运走了40个,王叔叔运走了
26个。还剩多少个?
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84-40-26=18(个)
84 -4 0
44
44 -26
18
口答:还剩18个。
深入探究
共有84个大南瓜,李大爷运走了40个,王叔叔运走了
26个。还剩多少个?
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先算一共运走的南瓜: 40+26=66(个)
再算还剩的南瓜:
84-66=18(个)
深入探究
共有84个大南瓜,李大爷运走了40个,王叔叔运走了 26个。还剩多少个?
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