What is the rule for rounding 555.555 to the nearest hundreth

To the nearest hundredth is 3 digits to the left of the decimal point.

We look at the digit to the right of that number.

If that number is 5 or higher, we round up. Else, round down.

5 is our third digit to the left of the decimal point. 5 is right beside that, therefore we round up.

555.555 rounded to the nearest hundredth is 600.