1010 1111 1000 1011(2) =
(1 × 215 + 0 × 214 + 1 × 213 + 0 × 212 + 1 × 211 + 1 × 210 + 1 × 29 + 1 × 28 + 1 × 27 + 0 × 26 + 0 × 25 + 0 × 24 + 1 × 23 + 0 × 22 + 1 × 21 + 1 × 20)(10) =
(32 768 + 0 + 8 192 + 0 + 2 048 + 1 024 + 512 + 256 + 128 + 0 + 0 + 0 + 8 + 0 + 2 + 1)(10) =
(32 768 + 8 192 + 2 048 + 1 024 + 512 + 256 + 128 + 8 + 2 + 1)(10) =
44 939(10)
The number 1010 1111 1000 1011(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
1010 1111 1000 1011(2) = 44 939(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.