Calculator Tricks 8

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
How did I know?

• Ill show you. I picked 654

• 654 456
• 198
• 198 891
• 1089

12
What did you think of that?

• Isnt Maths amazing?