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
I can tell you the original
number you selected
You don’t believe me?
Do you?
Watch this:
 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
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.
Now what did you
think of that?