Question

Which of these numbers can be divided by 9 without a remainder? How do you know? A-288 B-377 C-466 D-555

Answer 1

The original number is divisible by 9 if and only if the sum of it's digits
is divisible by 9.

$A.\\288\to2+8+8=18\ is\ divisible\ by\ 9\ \boxed{ANSWER}\\\\B.\\377\to3+7+7=17\ isn't\ divisible\ by\ 9\ \boxed{NO}\\\\C.\\466\to4+6+6=16\ isn't\ divisible\ by\ 9\ \boxed{NO}\\\\D.\\555\to5+5+5=15\ isn't\ divisible\ b\y\ 9\ \boxed{NO}$