Multiple choice general knowledge math & puzzles How many times the number 1 comes in between 1 to 100. 11 9 None of the above 1 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The digit 1 appears 20 times between 1 and 100: 1, 10, 11 (twice), 12-19 (eight times), and 21, 31, 41, 51, 61, 71, 81, 91 (nine more times). Since 20 isn't listed, 'None of the above' is correct.