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Calculator Tricks 8

Calculator Tricks 8. By Brian Carruthers (Please see notes on slide 1). Step One. Put a three digit number in descending order into the calculator. For example: 642 or 987. Step Two. Press the subtraction key. Step 3. Enter the same number in reverse order. For example: 246 or 789.

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Calculator Tricks 8

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  1. Calculator Tricks 8 By Brian Carruthers (Please see notes on slide 1)

  2. Step One • Put a three digit number in descending order into the calculator. • For example: 642 or 987

  3. Step Two • Press the subtraction key.

  4. Step 3 • Enter the same number in reverse order. • For example: 246 or 789

  5. Step 4 • Press the equals key.

  6. Step 5 • Keep the answer on the display. • Remember it and mentally reverse the answer.

  7. Step 6 • Press the add key.

  8. Step 7 • Enter the three digit number which you reversed.

  9. Step 8 • Press the equals sign.

  10. Guess what? The answer is 1089

  11. I’ll show you. I picked 654 654 – 456 = 198 198 + 891 = 1089 How did I know?

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

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