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  • The sum of the digits of the multiples of this number alw...
Multiple choice general knowledge math & puzzles

The sum of the digits of the multiples of this number always yields the same number. What is it?

  1. 3

  2. 4

  3. 8

  4. 9

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

The number 9 has a unique property where the digital root (repeated sum of digits) of any positive multiple of 9 is always 9. For example: 18 → 1+8=9, 27 → 2+7=9, 99 → 9+9=18 → 1+8=9.

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