I need a formula to take a number with several decimal places and round it up to two decimal places to either .33, .66 or, .00 if its above .66.

For example, 4.23423423423423 will be 4.33
4.43453453533434 will be 4.66
4.8353453453 will be 5.00


Lets say the number is in cell A1. What formula would do this?