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Calculator Tricks 4. By Brian Carruthers (Please see notes on slide 1). Lucky 7. or Unlucky 13. Step One. Think of a three-digit number Enter it twice on your calculator. For example: 123123 Now concentrate on the display. Step Two. I think that your number is divisible by 11.

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Calculator Tricks 4


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calculator tricks 4

Calculator Tricks 4

By

Brian Carruthers

(Please see notes on slide 1)

lucky 7

Lucky 7

or

Unlucky 13

step one
Step One
  • Think of a three-digit number
  • Enter it twice on your calculator.
  • For example: 123123
  • Now concentrate on the display.
step two
Step Two
  • I think that your number is divisible by 11.
  • Do you believe me?
  • If you don’t then I’ll prove it to you.
step three
Step Three
  • But, guess what:
  • Your answer displayed on your calculator is divisible by 13.
  • Again, use your calculator to check the answer.
watch this
Watch this:
  • Enter your original three-digit number twice on your calculator.
  • Divide that number by 11.
  • Now divide your result by 7.
  • Divide your answer by your original three digit number.
why does this work
Why does this work?
  • Entering a three-digit number twice
  • For example: 123123 is the same as multiplying it by 1001.
  • 123 x 1001 = 123,123.
  • Because 1001 = 7 x 11 x 13, the six-digit number will be divisible by 7, 11, 13, and your original three-digit number.
watch this11
Watch this:
  • 345345 divided by 11 = 31395
  • 31395 divided by 13 = 2415
  • 2415 divided by 345 = 7
  • 678678 divided by 11 = 61698
  • 61698 divided by 7 = 8814
  • 8814 divided by 678 = 13.