Hard
Classroom Math Riddles
11 XP

The Number Flip

24,051 solved 61% solve rate 39% fail rate
I am a two-digit number. When you flip me upside down, I increase by 21. What number am I?
Only 61% solve this correctly
24,051 attempts
Earn +11 XP for solving
Quick Answer & Explanation
68

The answer to this riddle is 68. Difficulty: Hard · Solved by 24,051 puzzle lovers.

68 (flipped upside down becomes 89, and 89 - 68 = 21)
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