## Thursday, 21 February 2013

### Algebra... Crystal Ball Gazing...

by Mr Johari

Could you UNCOVER THE MYSTERY behind the
crystal ball?

Post an explanation on the Math behind this.

1. YESSS I HAVE FOUND THE ANSWER !
SPOILER ALERT - IF YOU DO NOT WANT TO KNOW , DONT SCROLL DOWN, ALSO TRY TO FIGURE IT OUT FIRST-

After being mind blown by the trick multiple times initially , i suddenly observed a pattern in the final answers. All the final answers were multiples of 9. For example lets say my original number was 43. 4+3 = 7 , 43-7 = 36. 36 is a multiple of 9 and if you test it with every single 2 digit number , you will realise that is always multiple of 9. Looking at the number chart , i found out that the symbol for multiple of 9's were always the same and each round , the symbol would be changed to keep the mystery of the "mind reader" real. For example , all the multiples of 9 would have the symbol of a star at one round , and the next round all the multiples of 9 would have the symbol of a sun. Thus, the "mind reader" just had to bring out the symbol of multiples of 9 each round to "read your mind".
-Real Life Application-
To read other people's mind yourself , do the same thing as the "mind reader" did , but this time just ask for the number of 10's in the number. For example , 79 is my number . 7+9=16 , 79-16=63. 63 is my final answer and that can be achieved by multiplying the number of tens(7) by 9.
AWESOME ! im gonna read my mom's mind later :)

2. basically any multiple of 9 is represented by the same symbol, because all 2 digit numbesr if the digits are added up and then minus off the number, equals a multiple of nine. So all multiple of nine are represented by the same symbol and the symbol changes each time so that it looks as if at random. I actually played this when i was 8 years old so I still remember how it works. yay

3. It failed on me. I chose a square it gave me gemini

4. After you do the math the final answer you get is always 9. So you always will click on a multiple of 9. All they do is put the same symbol on all the multiples of 9.

5. I was supposed to get the yin yang symbol but it gave me a cross

6. It failed me too