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一、温习旧知促进迁移１ 口算训练。（口算卡片）６ +７８ +３５ +２７５ +８４ +９３４ +８（指名学生口述出５ +２７、３４ +８的口算过程）２ 两位数加法计算时应注意什么？二、创设情境探究新知１ 出示例３ :３４ +２８＝（１）引出课题师 :３４加２８怎样笔算？怎样写竖式
First, review the old knowledge to promote a migration calculation 1 training. (Mouth count card) 6 +78 +35 +275 +84 +934 +8 (Named students dictate 5 +27,34 +8 oral calculation process) 2 two-digit addition should pay attention to what? Second, the creation of a new situation to explore 1 1 Example 3: 34 +28 = (1) leads to division: 34 plus 28 how to calculate? How to write vertical