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Calculator Tricks 1

Calculator Tricks 1. By Brian Carruthers ( Please see notes on slide 1). Is that your final answer?. Pick a number between 1 and 9. Use a calculator to:. Multiply your number it by 9. Then multiply it by: 12,345,679. If you show me the result on your calculator.

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Calculator Tricks 1

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  1. Calculator Tricks 1 By Brian Carruthers (Please see notes on slide 1)

  2. Is that your final answer?

  3. Pick a number between1 and 9

  4. Use a calculator to: • Multiply your number it by 9. • Then multiply it by: • 12,345,679

  5. If you show me the result on your calculator I can tell you the original number you selected

  6. You don’t believe me? Do you?

  7. 1 = 111,111,111 2 = 222,222,222 3 = 333,333,333 4 = 444,444,444 5 = 555,555,555 6 = 666,666,666 7 = 777,777,777 8 = 888,888,888 9 = 999,999,999 Watch this:

  8. How did I know? • 9 x 12345679 = 111111111. • You multiplied your number by 111111111. • By the way, the 8-digit number (12,345,679) should be easily memorised: • only the 8 is missing from the sequence.

  9. Now what did you think of that?

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