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Hard Math Riddles – HARD-MATH #9

22,065 solved 62% solve rate 38% fail rate
Hard Math Riddle #9: What is 21 squared minus 45?
Only 62% solve this correctly
22,065 attempts
Earn +19 XP for solving
Quick Answer & Explanation
396

The answer to this riddle is 396. Difficulty: Hard · Solved by 22,065 puzzle lovers.

Calculate 21^2 first (441), then subtract 45.
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