一、数学运算符号的英文表达(小数、分数、百分数和运算符号)1. 小数表示法(1) 小数的读法小数点左边的数通常按基数词读，若为三位以上的数，也可按编码式读法读出，即将数字单个读出；小数点右边的数通常按编码式读法单个读出。
如：6.86 six point eight six14.15 fourteen point one five345.456 three four five point four five six或three hundred and forty－five point four five six(2) 小数中“0”的读法“0”在小数中通常读作nought（英）或zero（美），也可读作字母o。
如：0.08 （nought）point nought eight 或（zero）point zero eight9.07 nine point o seven2. 百分数表示法百分数中的百分号％读作percent。
如：6% 读作six percent0.6% 读作（nought）point six percent500% 读作five hundred percent3. 倍数表示法倍数表示方法很多，如：This room is four times as big as mine. 这个房间是我房间的四倍。
This room is three times larger than that one. 这个房间比那个房间大两倍。
The output of coal has doubled. 煤的产量增加了一倍。
My aunt is as old again as I am. 我姑姑年龄比我大一倍。
Productivity is increased three fold. 生产效率提高了两倍。
The volume of the Sun is about 1,300,000 times that of the Earth.太阳的体积约为地球的1300000倍。
4. 加减乘除式的读法6+5＝11 Six plus five is eleven 或Six and five is eleven.11-6＝5 Eleven minus six is five. 或Six from eleven is five.4×5＝20 Four multiplied by five is twenty.或Four times five is twenty.20÷4＝5 Twenty divided by four is five. 或Four into twenty goes five.15:5＝3 The ratio of fifteen to five is three.32 Three squared is nine.23 Two cubed is eight.24 The fourth power of two is sixteen.X^(1/2)=Y The square root of X is Y.X^(1/3)=Y The cubic root of X is Y.a ＞b a is more than b.a ＜b a is less than b.a ≈b a approximately equals to b.a ≠b a is not equal to b.5. 分数表示法(1) 较小分数的一般读写方法。
如：1/3 one-third 2/3 two-thirds 3/5 three-fifths(2) 较复杂分数的简明读写方法。
如22/9 twenty-two over ninea/b a over b 或a divided by b 43/97 forty-three over ninety-seven(3) 整数与分数之间须用and连接。
如：four and a half nine and two fifths(4) 分数用作前置定语时，分母要用单数形式。
注意下列写法与读法。
如：a one-third mile1/3英里a three-quarter majority3/4的多数二、常用标点符号用法．period 句号，comma 逗号：colon 冒号；semicolon 分号！exclamation 惊叹号？question mark 问号￣hyphen 连字符' apostrophe 省略号；所有格符号—dash 破折号‘’ single quotation marks 单引号“” double quotation marks 双引号( ) parentheses 圆括号[] square brackets 方括号《》French quotes 法文引号；书名号... ellipsis 省略号¨ tandem colon 双点号" ditto 同上‖ parallel 双线号／virgule 斜线号＆ampersand = and～swung dash 代字号§ section ;→ arrow 箭号；参见号＋plus 加号；正号－minus 减号；负号± plus or minus 正负号× is multiplied by 乘号÷ is divided by 除号＝is equal to 等于号≠ is not equal to 不等于号≡ is equivalent to 全等于号≌is equal to or approximately equal to 等于或约等于号≈ is approximately equal to 约等于号＜is less than 小于号＞is more than 大于号≮is not less than 不小于号≯is not more than 不大于号≤ is less than or equal to 小于或等于号≥ is more than or equal to 大于或等于号％per cent 百分之…‰ per mill 千分之…∞ infinity 无限大号∝varies as 与…成比例√ (square) root 平方根∵since ;∴hence 所以∷equals ,∠angle 角≲semicircle 半圆≰circle 圆○ circumference 圆周π pi 圆周率△triangle 三角形≱perpendicular to 垂直于∪union of 并，合集∩ intersection of 交，通集∫ the integral of …的积分∑ (sigma) summation of 总和°degree 度′ minute 分″ second 秒＃number …号℃Celsius system 摄氏度＠at 单价三、加、减、乘、除的表示法1．加：用and ,plus , added to 等词表示。
2 ＋4 ＝6 可译为：Two and four is six.Two plus four is equal to six.Two added to four equals six.Two and four makes six.Two plus four will be six.If you add two to four, you get six .2．减：用minus, taken from, subtracted from 等表示。
8－3=可译为：Eight minus three is five.Eight minus three is equal to five.Three taken from eight leaves five.Three subtracted from eight leaves five.Take three from eight and the remainder is five.3．乘：用multiply···by···/ multiplied by / time 等表示。
3 × 5 = 15可译为：Multiply three by five is (gives) fifteen.Three multiplied by five is fifteen.Multiply three by five, you get fifteen.Three times five is (makes, will be, equals, is equal to) fifteen.4．除：用divide···by···/ divided by / divide···into··· / into 等表示。
24 ÷ 8 = 3 可译为：Twenty-four divided by eight makes (is, equals) three.Twenty-four divided by eight is equal to three.Eight into twenty-four goes three times.Divide eight into twenty-four, and you get three.Divide twenty-four by eight, and you get three.四、度量衡分类1. 国际制度的单位国际制度（The International System，缩写为SI，是国际制度的法语名称）被1960年的第十一届大会用于度量衡。
公制的扩大和修改版本，即国际制度针对了现代科学附加的及更加正确的度量单位的需要。
国际制度的主要特点是采用了十进制法、字首体系、以不变的物理度量方式解释的标准。
2. 基本单位国际制度有基本单位，由此衍生出此制度中的其他单位。
除千克以外，基本单位的标准以不变的且可再生的物理事件为解释。
例如，公尺被解释为光在真空中以每1/299,792,458秒的速度所穿越的距离。
千克的标准是指置于法国塞夫勒的国际度量及标准局的白金铱圆柱为准。
计量单位计量范畴符号meter 公尺length 长度mkilogram 千克mass 质量kgsecond 秒time 时间sampere 安培electric current 电流 Akelvin 开temperature 温度Kmole 摩尔amount of matter 数量molcandela 烛光luminous intensity 发光强度cd3. 辅助单位国际制度采用了两种辅助单位，其依据于抽象的几何概念而非物理标准。