Espero haber entendido tu pregunta que tal si usas la funcion:TRUNC ( number [, precision] )
Parameter Description
number Any value.
precision The number of decimal places allowed in the truncated number. Omitting this argument assumes a precision of 0.
Remarks
TRUNC removes the fractional part of a number to the specified precision without rounding the number.
Examples
This function returns 123.45:
TRUNC(123.456, 2)
This function returns 9800:
TRUNC(9899.435, –2)