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一、整数和小数(一)整数的认识复习要点1.应理解、掌握的知识要点整数的意义;整数的数位顺序和计数单位;整数的读写方法及数的改写与省略.(如表1、表2)2.夏习的重点和难点重点:正确地读写多位数.会用万、亿作单位改写数和用四舍五入法截取近似数.难点:(1)正确理解整数的一些概念.(2)多位数中间有“0”的读写方法.3.正确认识易错概念(1)“自然数”与“整数”表示物体个数的1、2、3、4……都是自然数.自然数有无限个,最小的自然数是1,没有最大的自然数.零和自然数都是整数.整数包括自然数、零,但不能说整数只包括自然数和零.(2)“数字”“数位”和“位数”数字是记数的符号.0、1、2、3、4、5、6、7、8、9,叫做十个阿拉伯数字.记数时,各个不同的计数单位所占的位置叫做数位.含有几个数位的数,叫做几位数.
First, the integer and decimal (A) integer points of understanding Review points 1. It should be understood, grasp the point of knowledge Integer significance; Integer digit sequence and counting units; Integer read and write methods and the number of rewritten and omitted. (Table 1 , Table 2) 2. The key points and difficulties of summer focus: Correctly read and write multi-digit. Will be used million, 100 million units to rewrite the number and use the rounding method to intercept approximation Difficulties: (1) a correct understanding of some of the concepts of integers . (2) There is a “0” in the middle of multi-digit reading and writing .3. Correct understanding of the concept of error-prone (1) “natural number” and “integer” Natural numbers have an infinite number of natural numbers, the smallest natural number is 1, there is no maximum natural number. Zero and natural numbers are integers. Integer includes natural numbers, zeros, but can not say that integers only include natural numbers and zeros. (2) And “digits” are the notation of the numerator. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 are called ten Arabic numerals. Position is called a digit. Contains a few number of digits, called the number of digits.