ceil(123.456789) = 124
ceil(9.87654321) = 10
floor(123.456789) = 123
floor(9.87654321) = 9
round(123.456789) = 123
round(9.87654321) = 10
round(123.456789,2) = 123.46
round(9.87654321,2) = 9.88