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Calculator Tricks 3

Calculator Tricks 3. By Brian Carruthers (Please see notes on slide 1). The answer will always be 37. Think of a four-digit number and enter it twice into your calculator. For example: 12341234. I think that the number you have chosen. is divisible by 137. Don’t you believe me?.

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Calculator Tricks 3

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  1. Calculator Tricks 3 By Brian Carruthers (Please see notes on slide 1)

  2. The answer will always be 37 • Think of a four-digit number and enter it twice into your calculator. • For example: 12341234

  3. I think that the number you have chosen is divisible by 137

  4. Don’t you believe me? Why don’t you check this on your calculator?

  5. Now divide your eight-digit number by your original four-digit number

  6. Guess what? The answer is 73

  7. How did I know?

  8. Watch This: • Entering a four-digit number twice (12341234) is the same as multiplying it by 10001. • (1234 x 10001 = 12341234).

  9. Because 10001 = 73 x 137: • the eight-digit number will be divisible by 73, 137, and your original four-digit number.

  10. What did you think of that? Isn’t Maths amazing?

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