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Math Puzzle

Riddle:

What single-digit number should go in the box with the question?

6 5 9 2 7
1 4 3 5 ?
8 0 2 8 1
Answer:

The missing number is 4.  Simply add the first and second rows together to get the third row value.

  65, 927
+ 14, 354
  80, 281
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Math Riddles

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