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DD in Decimal

Hexadecimal DD equals 221 in decimal.

DD in all number bases

Decimal221
Hexadecimal0xDD
Binary1101 1101
Octal335

How dd converts from hexadecimal to decimal

Multiply each digit by 16 raised to its position (starting at 0 from the right), then add the results:

D× 161 = 13 × 16 = 208
D× 160 = 13 × 1 = 13

Sum: 221