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And they move them on of the then when they learn algebra, it falls apart. this simple thing about every number going down to 9 is something i discovered that i believe is the missing chapter in math. if every kid would learn this when theyre nine years old, every number on the planet earth would go back to their age. it would make them feel their every number is their friend, create number sense. >> gretchen: sort with zero instead of 1. >> i teach kids to go 0, one, two, three, four, five, six...