FLOOR

FLOOR(number, significance)

Returns the number rounded down to the nearest integer or significant figure.

number	The number to be rounded down.
significance	The multiple you want the number rounded to.

REMARKS

* This function is only available for backwards compatibility and should not be used.
* FLOOR.MATH was added in Excel 2013 to replace this function.
* If any of the arguments are not numeric, then #VALUE! is returned.
* If "number" or "significance" have different signs, then #NUM! is returned (last example ?)
* Regardless of the sign of number, a value is rounded down when adjusted away from zero. If number is an exact multiple of significance, no rounding occurs.
* 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 to round down to a specified number of digits.
* 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

	A
1	=FLOOR(2.5, 1) = 2
2	=FLOOR(-2.5, -2) = -2
3	=FLOOR(1.5, 0.1) = 1.5
4	=FLOOR(0.234, 0.01) = 0.23
5	=FLOOR(28.4, 0.5) = 28
6	=FLOOR(12.2, 0.5) = 12
7	=FLOOR(28.4, 0.1) = 28.4
8	=FLOOR(-2.5, 2) = -4