childrens numerical skills people appear to born to compute. The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth. Not long after learning to walk and talk, they can set the table with impress accuracy---one knife, one spoon, one fork, for each of the five chairs. Soon they are capable of nothing that they have placed five knives, spoons and forks on the table and, a bit later, that this amounts to fifteen pieces of silverware. Having thus mastered addition, they move on to subtraction. It seems almost reasonable to expect that if a child were secluded on a desert island at birth and retrieved seven years later, he or she could enter a second enter a second-grade mathematics class without any serious problems of intellectual adjustment. Of course, the truth is not so simple. This century, the work of cognitive psychologists has illuminated the subtle forms of daily learning on which intellectual progress depends. Children were observed as they slowly grasped-----or, as the case might be, bumped into-----concepts that adults take for quantity is unchanged as water pours from a short glass into a tall thin one. Psychologists have since demonstrated that young children, asked to count the pencils in a pile, readily report the number of blue or red pencils, but must be coaxed into finding the total. Such studies have suggested that the rudiments of mathematics are mastered gradually, and with effort. They have also suggested that the very concept of abstract numbers------the idea of a oneness,a twoness , a threeness that applies to any class of objects and is a prerequisite for doing anything more mathematically demanding than setting a table-----is itself far from innate
中考英语复习资料:六招搞定宾语从句
中考英语复习资料:中考冲刺英语专练第十讲
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中考英语复习资料:中考英语句型转换练习十
中考英语知识点:中考冲刺英语专练第六讲
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中考英语复习资料:中考英语不规则动词表2
中考英语知识点:中考英语词形填空题目汇编9
中考英语复习资料:中考英语单词拼写题目汇编7
中考英语知识点:中考英语词汇与语法强化训练4
中考英语复习资料:中考英语单词拼写题目汇编14
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中考英语知识点:中考英语词汇与语法强化训练3
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中考英语复习资料:中考英语句型转换题目汇编1
中考英语复习资料:中考冲刺英语专练第九讲
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中考英语知识点:中考英语词汇与语法强化训练16
中考英语知识点:中考冲刺英语专练第四讲
中考英语复习资料:中考英语含助动词句型精讲1
中考英语复习资料:中考冲刺英语专练第八讲
中考英语知识点:中考英语词汇与语法强化训练12
中考英语知识点:中考英语单词拼写题目汇编3
中考英语知识点:中考英语含助动词句型精讲3
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