教学目标
1.探索并掌握两位数减两位数退位减的计 算方法,进一步体会计算方法的多样 化。
2.发展初步的估算意识和解决实际问题 的能力。
3.培养同学们的知识迁移的能力,以及 小组互相合作的意识。
62-48= (下)
算一算
62-48= 14(下)
62-40=22 22-8=14
62-50=12 12+2=14
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