499.9595 rounded to the nearest thousandth is 499.960.
How to round it?
Identify the digit to round: The thousandth digit is the third digit after the decimal point, which is 9.
Look at the digit to the right: The digit to the right of the thousandth digit is 5, which is greater than or equal to 5, so we round up .
Rule for rounding: Since the digit to the right is greater than or equal to 5, we round the thousandth digit (9) up to 10, thus we add one to the hundredths digit.