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 number by 1 1/5

  1. Select a number.
  2. Multiply it by 5
  3. Divide the result by 6.

   Example:

  1. The number chosen to divide by 1 1/5 is 24.
  2. Multiply by 5: 5 x 24 = 120
  3. Divide by 6: 120/6 = 20
  4. So 24 divided by 1 1/5 = 20.

   See the pattern?

  1. The number chosen to divide by 1 1/5 is 76.
  2. Multiply by 5: 5 x 76 = 350 + 30 = 380
  3. Divide by 6: 380/6 = 63 2/6
  4. So 76 divided by 1 1/5 = 63 1/3.


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