By Brian Carruthers (Please see notes on slide 1)

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By Brian Carruthers (Please see notes on slide 1)

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Presentation transcript:

By Brian Carruthers (Please see notes on slide 1) Calculator Tricks 8 By Brian Carruthers (Please see notes on slide 1) WATCH THIS. 762 – 267 = 495 495 + 594 = 1089 Do you agree? IF YOU REALLY WANT TO IMPRESS YOUR STUDENTS, PUT THE ANSWER IN A SEALED ENVELOPE THEN OPEN IT AND SHOW THEM AFTER THE TRICK!

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

Step 4 Press the equals key.

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

Step 6 Press the add key.

Step 7 Enter the three digit number which you reversed.

Step 8 Press the equals sign.

Guess what? The answer is 1089

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

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