小数、分数、百分数和运算符号用英语怎么说？

小数

（1）小数读法

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 six
• 14.15 fourteen point one five
• 345.456 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 [nɔːt] （英）或 zero（美），也可读作字母 O。如：
• 0.08 （ nought） point nought eight 或 （ zero） point zero eight
• 9.07 nine point o seven

百分数

百分数中的百分号％读作 percent。如：

• 6% 读作 six percent
• 0.6% 读作 （ nought） point six percent
• 500% 读作 five hundred percent

倍数

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。

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.
• :
  Three squared is nine.
• :
  Two cubed is eight.
• :
  The fourth power of two is sixteen.
• :
  The square root of X is 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.

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 nine
   a/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 mile 1/3 英里 a three-quarter majority 3/4 的多数

英语菜鸟，如有错误，欢迎指正