Google Sheets Function: FLOOR
The FLOOR function rounds down a number based on the chosen factor.
Usage:
=FLOOR(number)
or
=FLOOR(number, factor)
Example of use
To round down a number to 0 decimal places and get an integer, enter:
=FLOOR(A2)

This formula is equivalent to:
=FLOOR(A2,1)
To round down a number to 2 decimal places, enter 0.01 as the second argument:
=FLOOR(A2,0.01)
