Find the number of zeroes at the end of the number 55! = 1·2·…·54·55
short answer: how many multiple of fives from 1 to 55? Answer5,10,15,20,25,30,35,40,45,50,55 or11
then how many fives are in 11/2? Answer 2
the number of zeroes at the end is 11+2=13
for how this works....https://www.youtube.com/watch?v=aVLVJustw9Y