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许多教师都发现,当学生面对“一本书有多厚?估计一下上海东方明珠塔大概有多高?从你家到学校大约有几米?南京长江大桥长几米?”等数学问题难于回答时,我们就常常归因于学生缺乏生活经验,缺乏对身边数学问题的观察与思考。当问到学生“我们学校的校长大约几岁?妈妈的身高大约多少?”时,听到的答案又出乎你的想象,让老师哭笑不得,非常无奈。这时,我们还能仅仅认为是孩子缺乏生活经验吗?答案肯定是不能。那么,会是什么原因呢?是因为学生严重缺乏数感,因此
Many teachers have found that when students are confronted with “How thick is a book? Estimate how tall the Oriental Pearl Tower in Shanghai is? How many meters from your home to the school? How many meters long can the Nanjing Yangtze River Bridge?” When we often attributed to the lack of life experience of students, lack of observation and thinking about the mathematical problems around. When asked the students “The principal of our school about how old? Mom about height?”, The answer is beyond your imagination, the teacher dumbfounding, very helpless. At this time, we can only think that children lack life experience? The answer is certainly not. So, what is the reason? It is because of the serious lack of number sense among students