There is no precise value, only a limit, which is never reached, only approached.
A precise value is limited to n digits, which if it is an evaluation, n must not be more than the least number of digits used in the calculation.
For example, 24 x 3600 could be rewritten as 2.4 x 10^1 * 3.600 x 10^3 = 2.4 * 3.600 * 10^4 = 8.640 * 10^4. To match the precision of the coefficients, this must be rounded down to 8.6 X 10^4.
The exception to the above would be if the result was being carried over to another calculation, in which case the value carried over would be 8.64 X 10^4, but the final result must still be reduced to two digits.