19 Childrens Numerical Skills
People appear to be 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 impressive accuracy -- one knife, one spoon, one fork, for each of the five chairs. Soon they are capable of noting 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-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 granted, as they refused, for instance, to concede that quantity is unchanged as water pours from a short stout 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.
7日雅思考试口语回忆
中国老人在加拿大学雅思英语的故事
雅思考试口语回忆12日
记雅思阅读笔记方法
烤鸭分享托福55一试雅思7分
2014年雅思口语真题回忆汇总
雅思高分考生经验分享:短期篇
2014年雅思考试A类听力回忆
一位残运会金牌得主的雅思经历
雅思作文5分升7分圆梦美国
3个月脱产复习雅思7.5分经验分享
雅思7.5分3个月全日制备考心得分享
雅思备考全面经验教训
老菜鸟考雅思6.5分的一些小体会
高中生雅思备考10天,二战终破7 听力8.5
2014雅思考试A类口语回忆
通过语言了解文化:17岁女孩裸考雅思拿下8.5分
雅思8.5分五味体验酸甜苦辣咸
注重细节:拿雅思听力阅读双八分
雅思口语三战升7经验之谈
雅思复议7.5心路历程
8日雅思考试口语回忆(持续更新)
英语高手裸考雅思8.5分
2014年雅思考试A类阅读回忆
雅思8分考生的珍贵心得制造英语环境
华师大考场全攻略
留美考生谈新雅思考试
考生雅思8分心得:兴趣与技巧同样重要
英语白痴三周备考,首战雅思6.5
在绝望中寻找希望 10天突破7.5
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |