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- 8 years agoFavorite Answer
It seems that when you add up the two numbers of a two digit number they will all end up at the same number, while they are in their decade. An example is 99= 9+9=18 99-18= 81, so every number that is in the 90s will end up at 81. Each number in the same decade will end up at a certain number 90s= 81 80s= 72, 70s= 63 60s= 54, 50s= 45, 40s= 36, 30s= 27, 20s= 18, 10s= 9, hope this makes sense. The person who created this just put the same symbol on each on the certain numbers
