小数

Decimal [ˈdesɪml] Fraction

• 用point连接整数部分(the integral part)与小数部分，如zero/nought point two six。

• 精确到3个有效数字，correct to three significant figures。

• 精确到小数点后2位，correct to two decimal places。

• 四舍五入，rounding up or down，举例如下：

  • If the spreadsheet column is not wide enough to show all available decimal places, then the spreadsheet will round the number to the available column width.

  • Some items vary from month to month, like the phone bill for example, so track the amounts for a few months, take an average, and round up to the nearest $10.

  • Lastly, it stores the cleaned up and rounded value in the database.