How many zeroes does 66^2 end in when written in base 12?
66^2 ==4.356 in base 10 ==3,630 in base 12
Here's one way to do this :
66^2 = 435610
4356/12 = 363 Remainder 0
363 / 12 = 30 Remainder 3
30/12 = 2 Remainder 6
2 / 12 = 0 Remainder 2
Read the remainders from bottom to top = 263012