Multiple choice general knowledge math & puzzles

If you write down all the numbers from 1 to 100, then how many times you write 3?

  1. 18

  2. 22

  3. 20

  4. 21

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The digit 3 appears in the units place 10 times (3, 13, 23...93) and in the tens place 10 times (30, 31, 32...39). Total occurrences: $10 + 10 = 20$. Note that 33 counts twice (once for each place), which is included in this count.