2. Multiply each bit by its corresponding power of 2 and add all the terms up.
1101 1000 1110 1010 1100 0010 1100 1100 1101 0010 1101 1000 1100 1101(2) =
(1 × 255 + 1 × 254 + 0 × 253 + 1 × 252 + 1 × 251 + 0 × 250 + 0 × 249 + 0 × 248 + 1 × 247 + 1 × 246 + 1 × 245 + 0 × 244 + 1 × 243 + 0 × 242 + 1 × 241 + 0 × 240 + 1 × 239 + 1 × 238 + 0 × 237 + 0 × 236 + 0 × 235 + 0 × 234 + 1 × 233 + 0 × 232 + 1 × 231 + 1 × 230 + 0 × 229 + 0 × 228 + 1 × 227 + 1 × 226 + 0 × 225 + 0 × 224 + 1 × 223 + 1 × 222 + 0 × 221 + 1 × 220 + 0 × 219 + 0 × 218 + 1 × 217 + 0 × 216 + 1 × 215 + 1 × 214 + 0 × 213 + 1 × 212 + 1 × 211 + 0 × 210 + 0 × 29 + 0 × 28 + 1 × 27 + 1 × 26 + 0 × 25 + 0 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20)(10) =
(36 028 797 018 963 968 + 18 014 398 509 481 984 + 0 + 4 503 599 627 370 496 + 2 251 799 813 685 248 + 0 + 0 + 0 + 140 737 488 355 328 + 70 368 744 177 664 + 35 184 372 088 832 + 0 + 8 796 093 022 208 + 0 + 2 199 023 255 552 + 0 + 549 755 813 888 + 274 877 906 944 + 0 + 0 + 0 + 0 + 8 589 934 592 + 0 + 2 147 483 648 + 1 073 741 824 + 0 + 0 + 134 217 728 + 67 108 864 + 0 + 0 + 8 388 608 + 4 194 304 + 0 + 1 048 576 + 0 + 0 + 131 072 + 0 + 32 768 + 16 384 + 0 + 4 096 + 2 048 + 0 + 0 + 0 + 128 + 64 + 0 + 0 + 8 + 4 + 0 + 1)(10) =
(36 028 797 018 963 968 + 18 014 398 509 481 984 + 4 503 599 627 370 496 + 2 251 799 813 685 248 + 140 737 488 355 328 + 70 368 744 177 664 + 35 184 372 088 832 + 8 796 093 022 208 + 2 199 023 255 552 + 549 755 813 888 + 274 877 906 944 + 8 589 934 592 + 2 147 483 648 + 1 073 741 824 + 134 217 728 + 67 108 864 + 8 388 608 + 4 194 304 + 1 048 576 + 131 072 + 32 768 + 16 384 + 4 096 + 2 048 + 128 + 64 + 8 + 4 + 1)(10) =
61 056 717 350 426 829(10)
The number 1101 1000 1110 1010 1100 0010 1100 1100 1101 0010 1101 1000 1100 1101(2) converted from an unsigned binary (in base 2) and written as a positive integer (with no sign) in decimal system (in base ten):
1101 1000 1110 1010 1100 0010 1100 1100 1101 0010 1101 1000 1100 1101(2) = 61 056 717 350 426 829(10)
Spaces were used to group digits: for binary, by 4, for decimal, by 3.