2022年数学小学四年级数学知识点归纳 .pdf
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1、1/16 小学四年级数学知识点归纳四年级上册知识点概括总结1.大数的认识:(1)亿以内的数的认识:十万:10 个一万;一百万:10 个十万;一千万:10 个一百万;一亿:10 个一千万;2.数级:数级是为便于人们记读阿拉伯数的一种识读方法,在位值制(数位顺序)的基础上,以三位或四位分级的原则,把数读,写出来。通常在阿拉伯数的书写上,以小数点或者空格作为各个数级的标识,从右向左把数分开。3.数级分类(1)四位分级法即以四位数为一个数级的分级方法。我国读数的习惯,就是按这种方法读的。如:万(数字后面 4 个 0)、亿(数字后面 8 个 0)、兆(数字后面 12 个 0,这是中法计数)。这些级分别叫
2、做个级,万级,亿级。(2)三位分级法2/16 即以三位数为一个数级的分级方法。这西方的分级方法,这种分级方法也是国际通行的分级方法。如:千,数字后面3 个 0、百万,数字后面 6 个 0、十亿,数字后面9 个 0。4.数位:数位是指写数时,把数字并列排成横列,一个数字占有一个位置,这些位置,都叫做数位。从右端算起,第一位是“个位”,第二位是“十位”,第三位是“百位”,第四位是“千位”,第五位是“万位”,等等。这就说明计数单位和数位的概念是不同的。5.数的产生:阿拉伯数字的由来:古代印度人创造了阿拉伯数字后,大约到了公元 7 世纪的时候,这些数字传到了阿拉伯地区。到13 世纪时,意大利数学家斐波
3、那契写出了算盘书,在这本书里,他对阿拉伯数字做了详细的介绍。后来,这些数字又从阿拉伯地区传到了欧洲,欧洲人只知道这些数字是从阿拉伯地区传入的,所以便把这些数字叫做阿拉伯数字。以后,这些数字又从欧洲传到世界各国。阿拉伯数字传入我国,大约是13 到 14 世纪。由于我国古代有一种数字叫“筹码”,写起来比较方便,所以阿拉伯数字当时在我国没有得到及时的推广运用。本世纪初,随着我国对外国数学成就的吸收和引进,阿拉伯数字在我国才开始慢慢使用,阿拉伯数字在我国推广使用才有 100 多年的历史。阿拉伯数字现在已成为人们学习、生活和交往中最常用的数字了。6.自然数:用以计量事物的件数或表示事物次序的数。即用数码
4、 0,1,2,3,4,所表示的数。表示物体个数的数叫自然数,自然数由 0 开始(包括 0),一个接一个,组成一个无穷的集体。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X
5、8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10
6、L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4
7、H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X
8、8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10
9、L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4
10、H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X
11、8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L23/16 7.计算工具:算盘、计算器、计算机。8.射线:在几何学中,直线上的一点和它一旁的部分所组成的图形称为射线。如下图所示:8.射线特点(1)射线只有一个端点,它从一个端点向另一边无限延长。(2)射线不可测量。文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2
12、U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R
13、1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A
14、10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2
15、U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R
16、1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A
17、10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2
18、U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L24/16 9.直线:直
19、线是点在空间内沿相同或相反方向运动的轨迹。10.线段:线段用表示它两个端点的字母或一个小写字母表示,有时这些字母也表示线段长度,记作线段或线段,线段a。其中表示直线上的任意两点。11.线段特点(1)有限长度,可以测量(2)两个端点12.线段性质:(1)两点之间线段最短。(2)连接两点间线段的长度叫做这两点间的距离。(3)直线上两个点和它们之间的部分叫做线段,这两个点叫做线段的端点。直线没有距离。射线也没有距离。因为,直线没有端点,射线只有一个端点,可以无限延长。13.角(1)角的静态定义具有公共端点的两条不重合的射线组成的图形叫做角。这个公共端点叫做角的顶点,这两条射线叫做角的两条边。(2)角
20、的动态定义一条射线绕着它的端点从一个位置旋转到另一个位置所形成的图形叫做角。所旋转射线的端点叫做角的顶点,开始位置的射线叫做角的始边,终止位置的射线叫做角的终边文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1
21、A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z
22、2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7
23、R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1
24、A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z
25、2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7R1X8K10 HT10N2Z2U4H10 ZF10C5M1A10L2文档编码:CL5Y7
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