2. Multiply each bit by its corresponding power of 2 and add all the terms up.
1001 0000 0010 1111 0101 0000 0000 1001 0000 0000 0000 0000 0000 0000 1010 0000(2) =
(1 × 263 + 0 × 262 + 0 × 261 + 1 × 260 + 0 × 259 + 0 × 258 + 0 × 257 + 0 × 256 + 0 × 255 + 0 × 254 + 1 × 253 + 0 × 252 + 1 × 251 + 1 × 250 + 1 × 249 + 1 × 248 + 0 × 247 + 1 × 246 + 0 × 245 + 1 × 244 + 0 × 243 + 0 × 242 + 0 × 241 + 0 × 240 + 0 × 239 + 0 × 238 + 0 × 237 + 0 × 236 + 1 × 235 + 0 × 234 + 0 × 233 + 1 × 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 + 1 × 27 + 0 × 26 + 1 × 25 + 0 × 24 + 0 × 23 + 0 × 22 + 0 × 21 + 0 × 20)(10) =
(9 223 372 036 854 775 808 + 0 + 0 + 1 152 921 504 606 846 976 + 0 + 0 + 0 + 0 + 0 + 0 + 9 007 199 254 740 992 + 0 + 2 251 799 813 685 248 + 1 125 899 906 842 624 + 562 949 953 421 312 + 281 474 976 710 656 + 0 + 70 368 744 177 664 + 0 + 17 592 186 044 416 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 34 359 738 368 + 0 + 0 + 4 294 967 296 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 128 + 0 + 32 + 0 + 0 + 0 + 0 + 0)(10) =
(9 223 372 036 854 775 808 + 1 152 921 504 606 846 976 + 9 007 199 254 740 992 + 2 251 799 813 685 248 + 1 125 899 906 842 624 + 562 949 953 421 312 + 281 474 976 710 656 + 70 368 744 177 664 + 17 592 186 044 416 + 34 359 738 368 + 4 294 967 296 + 128 + 32)(10) =
10 389 610 864 951 951 520(10)
The number 1001 0000 0010 1111 0101 0000 0000 1001 0000 0000 0000 0000 0000 0000 1010 0000(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
1001 0000 0010 1111 0101 0000 0000 1001 0000 0000 0000 0000 0000 0000 1010 0000(2) = 10 389 610 864 951 951 520(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.