FLOOR.MATH 
FLOOR.MATH(number [,significance] [,mode]) 
Returns the number rounded down to the nearest integer or significant figure (including negative). 
number  The number to be rounded down. 
significance  (Optional) The multiple you want the number rounded to. 
mode  (Optional) A logical value indicating whether to round negative numbers up or down: True = Negative numbers are rounded up towards zero False = Negative numbers are rounded down away from zero (default) 
REMARKS 
* This function was added in Excel 2013 to replace the FLOOR.PRECISE and FLOOR functions. * Positive decimal numbers are rounded down to the nearest integer. * Negative decimal numbers are rounded down to the nearest integer. * If "number" is an exact multiple of "significance", there will be no rounding. * If "number" is divided by a significance of 2 or greater, results in a remainder, the result is rounded down. * The "significance" argument will determine how the "number" is rounded down. * If "significance" is left blank, then 1 is used. * If "significance" > 0, then "number" is rounded down to an exact multiple of "significance". * If "significance" < 0, then the absolute value is taken. * If "mode" is left blank, then False is used. * The "mode" argument only affects negative numbers. * The "mode" argument can also take numerical values. 0 is equivalent to False. Any other number is equivalent to True. * You can use the CEILING.MATH function to round up to the nearest integer or significant figure. * You can use the INT function to return a number rounded down to the nearest integer. * You can use the MROUND function to round to a desired multiple. * You can use the NOW function to return the serial number of the current system date and time. * You can use the ROUND function to round to a specified number of digits. * You can use the ROUNDDOWN function if you always want the number rounded down to the nearest integer. * You can use the TRUNC function to return the number with any decimal places removed. * For the Microsoft documentation refer to support.microsoft.com * For the Google documentation refer to support.google.com 

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