presuming you mean ten bits, every bit is a power of 2, beginning with power 0, right to left.
So, 11 = 2^1+2^0=3 and 101=2^2+0+2^0=5
The value of a ten bit word depends on the bits which are set (=1).
This allows representation of values from 0 through 1023, effectively 1K as rounded in "computerese". All bits set=1 yields 1023, no bits set (all clear) yields 0.