2. Multiply each bit by its corresponding power of 2 and add all the terms up.
1110 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0110 1111(2) =
(1 × 251 + 1 × 250 + 1 × 249 + 0 × 248 + 0 × 247 + 0 × 246 + 0 × 245 + 0 × 244 + 0 × 243 + 0 × 242 + 0 × 241 + 0 × 240 + 0 × 239 + 0 × 238 + 0 × 237 + 0 × 236 + 0 × 235 + 0 × 234 + 0 × 233 + 0 × 232 + 0 × 231 + 0 × 230 + 0 × 229 + 0 × 228 + 0 × 227 + 0 × 226 + 0 × 225 + 0 × 224 + 0 × 223 + 0 × 222 + 0 × 221 + 0 × 220 + 0 × 219 + 0 × 218 + 0 × 217 + 0 × 216 + 0 × 215 + 0 × 214 + 0 × 213 + 0 × 212 + 0 × 211 + 0 × 210 + 0 × 29 + 0 × 28 + 0 × 27 + 1 × 26 + 1 × 25 + 0 × 24 + 1 × 23 + 1 × 22 + 1 × 21 + 1 × 20)(10) =
(2 251 799 813 685 248 + 1 125 899 906 842 624 + 562 949 953 421 312 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 64 + 32 + 0 + 8 + 4 + 2 + 1)(10) =
(2 251 799 813 685 248 + 1 125 899 906 842 624 + 562 949 953 421 312 + 64 + 32 + 8 + 4 + 2 + 1)(10) =
3 940 649 673 949 295(10)
The number 1110 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0110 1111(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
1110 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0110 1111(2) = 3 940 649 673 949 295(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.