F.1 Maths.(15分)

Rounding up=只要有尾數，就要進位。
Example:1841,round up to the nearest ten=1850
Rounding off=用四捨五入的方法
Example:1841,round off to the nearest ten=1840
Rounding down=只要有尾數，就要退位。
Example:1841,round down to the nearest ten=1840



2011-02-06 01:28:38 補充：
Front-end method =只取數字的第一個位為近似值

Example:1841,use Front-end method=1000