2025年教学资料:估算好还是准确计算好呢?
估算好还是准确计算好呢?师:你(不估算,坚持精算的学生)听了同学们的发言,有什么想法?生:我还是觉得我的计算结果比他们的准确。师:好,看来你还是坚持自己的想法。没关系,到底是估算好还是准确计算好呢?我们慢慢体会。师:同学们,看着这个精确计算的结果,再看看同学们估的结果——2400,2100,2110,1800,你对自己的估算结果有什么评价或思考吗?生:我估的是1800,实际结果差得就远了。像398不应估成300,估成400更好些。师:你很善于思考,其实你估的结果已经可以了,但是你还能在与他人的比较中发现问题,进行调整,老师为你的这种善于学习,善于反思的精神而感动。生:我估的是2110.我觉得我...
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