Hard
Number Puzzles
14 XP

The Digit Sum

17,344 solved 72% solve rate 28% fail rate
What is the sum of all digits from 1 to 99?
Only 72% solve this correctly
17,344 attempts
Earn +14 XP for solving
Quick Answer & Explanation
900. Each tens place

The answer to this riddle is 900. Each tens place. Difficulty: Hard · Solved by 17,344 puzzle lovers.

900. Each tens place (1-9) appears 10 times as tens digit (10 × 45 = 450). Each units digit (0-9) appears 10 times (10 × 45 = 450). Total = 900.
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