Something to do with the number 9

?
Like Rob said #9
the answers always a multiple of 9 so the same shapes are alocated to mulitples of 9 .
9,18,27, etc etc the shapes change each time so you dont pick it up easily.
you will always end up with a mutiple of nine e.g. 9,18,27,36,45,54,63,72,81.
And everone of these numbers has the same simbol
beat me to it Leonard
very cool showed my mum and she was amazed and said there's a trick to it lol on ya mum ya cant fool my mum lol