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|1 × 21  || (1 × 2 = 2)           || plus

|1 × 20  || (1 × 1 = 1)           || plus

|0 × 2−1 || (0 × ½ = 0)    || plus

|1 × 2−2 || (1 × ¼ = 0.25)

For a total of 3.25 decimal.

All dyadic rational numbers  have a terminating binary numeral—the binary representation has a finite number of terms after the radix point.  Other rational numbers have binary representation, but instéad of terminating, they recur, with a finite sequence of digits repéating indefinitely.  For instance