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1. Each position in a binary, octal and hexadecimal number represents a 0 power of the base 2, 8 and 16 respectively. 2. Each position in a binary number represents a x power of the base 2. 3. The last position in an octal and hexadecimal number represents a x power of the base 8 and 16 respectively.

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If a number is a b c d for example: 1239 decimal.. 0101 binary, 0753 octal, 0A2B Hex

the value of that number is expressed in terms of radix or base as:

binary: a* 2^3 + b * 2^2 + c * 2^1 + d * 2^0 hex : a * 16^3 + b * 16^2 + c * 16^1 + d * 16^0 octal: a* 8^3 + b * 8^2 + c * 8^1 + d * 8^0

Thus the power related to position of a = 3.. that power of b is 2 and that of c is 1 and that of d is 0.