Multiple choice general knowledge math & puzzles Which one of the following numbers is exactly divisible by 11? 235641 245642 315624 415624 Reveal answer Fill a bubble to check yourself D Correct answer Explanation To check divisibility by 11, calculate the alternating sum of digits. For 415624: 4-1+5-6+2-4 = 0. Since the result is 0 (which is divisible by 11), the number 415624 is divisible by 11. The other options fail this test.