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Non-information

There are a number of facts that are the equivalent to '10' is the same as '10'.

10 is the lowest two digit number in base 10. Well of course it is just as 2 is the lowest 2 digit number in binary and 8 is the lowest two digit number in octal. It's part of the definition of a number base.
The basic calculation section is simply reiterating that we use numbers base ten. $abc\times 10=abc0$ and $abc\div 10=ab\cdot c$ . Similarly $10^{n}=10...0$ (n zeroes).
The indexed sequence of triangle numbers is just a statement that our numbers are written using base ten. In octal and hex
$\triangle 10_{8}=44_{8}$ , $\triangle 10_{16}=88_{16}$

$\triangle 100_{8}=404_{8}$ , $\triangle 100_{16}=808_{16}$
Age ten is a preteen and a denarian. This is from the definition of these words