Hey Guys,
The funda behind this magic reader is tht all the calculations you do,you will end up with number which is an exact multiple of 9.Let me explain you with two examples:
E:g1:
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Take Number as 52:
Add 5+2 = 7
52-7=45 (which is a multiple of 9)
E.g:2
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Take number 17
Add 1+7=8
17-8=9 (which is a multiple of 9)
When you look at the chart you can find that all the multiples of 9 (9,18,27,36...81) will have the same symbol.(90 will have a different symbol cos u can't get 90)
The mathematical explanation is under:
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Let the 2 digit number be 10x+y.
Add the number

x+y)
subract from the original Number

10x+y)-(x+y)
=9x
So you will end up with some multiple of 9.
Start reading ur frnd's mind
-Deepak.