No one knows for sure just yet
It is estimated that around 200 Jedi survived Order 66, as they were able to escape or were off-world when the order was issued. These survivors went into hiding to avoid detection by the Empire.
Over half the masters and knights died because of order 66 and the clones
clone trooper thrier followed to execute order 66 he survived order 66 but in the rebelion alligance the battle of stormtroopers it appears he was shot by one of the rebellion alliance in corisant.
To a first order of rounded approximation: 66 of them
K'Kruhk does not die, and he survives Order 66 and joins Luke's new Jedi Order
http://en.wikipedia.org/wiki/List_of_passengers_on_board_RMS_Titanic By my reckoning 66 children under 16 survived.
Bant was nearly killed by Qui-Gon Jinn's renegade padawan, Xanatos, but she survived. She was presumably killed in Order 66, the Great Jedi Purge.
66 ones go into 66
66 inches is 66 inches.
66 inches is 66 inches.
Whether or not Rex was even around during Order 66 is still to be revealed
Order 66 was the codename for the command that all the Clone Troopers should immediately turn on their Jedi commanders and kill them. Palpatine gave the order and told the Clone Commanders it was because the Jedi were exacting their plot to take control of the Republic, but it was actually Palpatine that was taking control.
66 inches=5.5 feet