Convert whole number to Decimal in fast formula

Hi Team,

We have a requirement to convert the number with two decimal positions. I am able to do with Round/Round_up function for decimal numbers.

However, if it is a whole number (without decimal positions) , not able to convert it.

Even I tried to concatenate the decimal positions, but the decimal positions are missing when I convert that to number.

Can you please suggest if we have any function or other way to achieve this ?

Below is the ode snippet I tried,

l_run =561

l_run=TO_NUMBER(TO_CHAR(l_run)||'.00')

log= ess_log_write('l_run'||to_char(l_run))