Just cause "One plus one is two, so what is going on if you write two as 10? (One warning here. Read 10 as one-zero not ten. It's not ten, it's two but written one-zero.) One place that the number two is written 10 is in base 2 arithmetic. I want to say something about base 10 arithmetic first.
In base 10 arithmetic we have ten symbols for digits. They are 0,1,2,3,4,5,6,7,8, and 9. We write the counting numbers using these symbols" does not mean it is correct
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