0-4 = round down
5-9 = round up
6 = round up
8 + 1 = 9
8.6 rounded to the nearest whole number is 9.
since the 6 is greater than 5, 8.6 rounds to 9
if the number AFTER the one you are rounding to is 5 or greater round up, if it's less than 5 round down