Scary at first!
Got my pen out - sussed it!
Tried a figure in the 10's, then 20's etc. and yes - when I checked the chart without clicking the crystal ball, all the symbols were the same on any given chart. The symbols change every time, but 9, 18, 27, 36 etc will always have the same symbol!
Very clever! I love these mathematical puzzels and have a book with more in.
Heather.
|