There are a couple of options, but the most common is;
float( decimal( Value1, 13, 2 ) / decimal( Value2, 9, 3 ) )
or a variation of the statement.
decimal changes the value of "Value1" to a 13,2 field
Float floats the decimal point
You could also enter;
decimal(float(~~~~~~~), 13,2) = results in a 13,2 field