Multiple choice general knowledge math & puzzles If you count from 1 to 100, how many 7's will you pass on the way? 10 11 19 20 Reveal answer Fill a bubble to check yourself D Correct answer Explanation There are 20 sevens: 7, 17, 27, 37, 47, 57, 67, 70, 71, 72, 73, 74, 75, 76, 77 (two sevens), 78, 79, 87, 97. Counting each digit '7', the total is 20. Many people forget to count the '7' in the tens place for the 70s or the double '7' in 77.