Note that I follow convention when a common base is not implied and explicitly state the base as a subscript to the number.
Decimal (base-10, or denary)
What does 28810 mean, exactly? This value explicates that this number encompasses two 100's, eight 10's, and 8 units. This can be succinctly shown as:
28810 = (2 * 100) + (8 * 10) + (8 * 1)
28810 = (2 * 102) + (8 * 101) + (8 * 100)
= 200 + 80 + 8
htun = (h * n2) + (t * n1) + (u * n0) where h=hundreds,t=tens,u=units
As read across left to right, each number increases the total value by that number * base to the power of its place. This notation will become useful when I show you how to convert any base into base-10/decimal in the next step. There's not much to say about denary until a few more steps.
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