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1、掌握有关自然数、整数、小数、分数的意义,读法和写法;会用“万”、“亿”作单位记数。2、理解整数、偶数、奇数、质数、合数、质因数、约数、倍数、互质数等概念。熟练地掌握能被2、3、5整除的数的特征;掌握能被7、11、13、17、19、23等数整除的数的特征;能正确地分解质因数。会求两、三个数的最大公约数和最小公倍数。 3、掌握商不变的性质、小数的性质、分数的基本性质和比的基本性质,能正确地进行通分、约公,比较分数的大小;能正确地进行复名数和小数的互化,以及分数、小数、百分数的互化。
1, master the meaning of natural numbers, integers, decimals, fractions, reading and writing; will use “million”, “million” for the unit count. 2, to understand the concept of integer, even, odd, prime, composite, prime factor, divisor, multiple, prime prime. Skillfully grasp the characteristics of numbers that can be divisible by 2, 3, and 5; Grasp the number of features that can be divisible by 7, 11, 13, 17, 19, 23, etc .; Find the greatest common divisor and the least common multiple of two or three numbers. 3, grasp the nature of business invariants, the nature of decimals, the basic nature of the basic nature of scores and the ratio of the basic nature of the points can be carried out correctly, about the size of the comparison scores; , As well as scores, decimals, percentages of each other.