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# Mathematics in English!! [Copy link] 中文 分享按钮  Post time 2004-9-20 10:36:47 |Display all floors
 ARITHMETIC: 算术 1. Numbers 数 1, 2, 3, 4, 5, ...... are called natural numbers (自然数). They are positive integers (正整数). 2, 4, 6, 8, 10, ...... are even numbers (偶数). They are natural numbers that are exactly divisible by 2 (可以被2整除). 1, 3, 5, 7, 9, ...... are odd numbers (奇数). They are natural numbers that are not exactly divisible by 2. (to be continued)  Post time 2004-9-20 15:44:49 |Display all floors

## Numbers

 A prime number (质数) is an integer (整数) that is not divisible by any other numbers except 1 and itself. eg: 2, 3, 5, 7, 11, 13, 17, 19, 23, ...... An integer is called a composite number (合成数) if it is not a prime number. eg: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, ...... A factor (因数) is a natural number that will divide exactly (整除) into another number. eg: 3 is a factor (因数) of 21. 7 and 9 are both factors of 63. H.C.F. and L.C.M. (最大公因数和最小公倍数) The greatest number that is a common factor (公因数) of two or more given numbers is called the highest common factor (H.C.F.). The lowest number that is a common multiple (公倍数) of two or more given numbers is called the lowest common multiple (L.C.M.). (to be continued)  Post time 2004-9-20 15:49:31 |Display all floors

## Decimal Numbers (小数)

 Decimals are based on ten, multiples of ten, and tenths. A decimal point separates natural numbers from decimal fractions. 小数由十, 十的倍数和十分位的倍数组成. 小数点把自然数与小数部分分开. 小数点: Decimal point 小数位: Decimal place (D.P.) (to be continued)
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