瑞士著名心理学家皮亚的心理发展阶段论理论认为:儿童7～12岁处于具体运算阶段,这一阶段的儿童运算还离不开具体事实的支持,只能把逻辑运算应用于具体的或观察所及的事物中,而不能把逻辑运算扩展到抽象概念中。因此,小学数学教学必须开放小课堂,把社会生活这个广阔天地作为学生 The well-known Swiss psychologist Pia's stage theory of psychology that: children aged 7 to 12 years in a specific computing phase, this stage of children's computing is inseparable from the support of specific facts, only logical operations applied to specific or Observe the things involved, but can not be extended to the logical operation of abstract concepts. Therefore, primary school mathematics teaching must open a small classroom, the social life of this vast world as a student