Look for a perpetual calendar on the Net, that should help. You would think there would be 25 but I am not sure they didn't skip a leap year in the year 2000 (which was the final year of the 20th...
One century is equal to 100 years, therefore 100 x 9 = 900, so 900 years are in 9 centuries.
SIX
four one thousands and seven one hundreds dummies
two.