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Puzzle ZAMH 


Can you find three consecutive odd numbers that... 1,287 when multiplied together?

Puzzle Copyright © Kevin Stone

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9 x 11 x 13.

Since we're after three numbers that multiply together, a good place to start is the cube root of 1,287, which is roughly 10.88.

Let's try dividing by the closest odd number to 10.88:

   1287 ÷ 11 = 117

We're now after whole divisors of 117, so trying either odd number either side of 11 might work.

Trying either 9 or 11 gives the answer.

   9 x 11 x 13 = 1,287

Trying the closest odd number to the cube root always works, and the other two numbers are the odd numbers either side.


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