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In BCD, the binary patterns 1010 through 1111 do not represent valid BCD numbers, and cannot be used.
You merely assign each digit of the decimal number to a byte and convert 0 through 9 to 0000 0000 through 0000 1001, but you cannot perform the repeated division by 2 as you did to convert decimal to binary.
BCD is still a weighted position number system so you may perform mathematics, but we must use special techniques in order to obtain a correct answer.
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