100以内数的认识和加减法,在本质上与万以内数的认识和加减没有严格区别,为什么要把100以内作为一个循环段呢?这主要是从教学角度考虑的。因为学生生活经验少,他们在日常生活中接触到的数多半是100以内的数。在认数过程中,我们不仅要使儿童掌握数数的顺序,而且还要掌握计数单位及数位的认识,教得多了,学生就 There is no strict distinction between understanding and addition and subtraction of the number within 100 and the understanding and addition or subtraction of the number within one million. Why is it necessary to regard as a cycle within 100? This is mainly from the teaching point of view. Because students have little life experience, most of them come into contact with their daily lives are less than 100. In the process of accreditation, we must not only make children grasp the order of numbers, but also acquire knowledge of counting units and digits. When teaching students more