BEATCALC:  Beat the Calculator!

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Back to Calculation Tips & Tricks
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From the BEATCALC mailing list:
a weekly service from B. Lee Clay, archived here by the Math Forum.
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   Dividing a repeating 3-digit number by 37
                 and adding 41

  1. Select a repeating 3-digit number .
  2. The answer is 3 times one of the digits plus 41!

   Example:

  1. Select 999.
  2. Multiply one digit by 3: 9 x 3 = 27.
  3. Add 41: 27 + 41 = 68.
  4. So (999 / 37) + 41 = 68.

Change the last step to add other numbers, and thus produce many new exercises.


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17 February 1997
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