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What Is BCD Arithmetic ?








  • BCD is a binary code of the ten decimal digits. It is not a binary equivalent.
  • To perform BCD addition
  1. Add the BCD digits as regular binary numbers.
  2. If the sum is 9 or less and no carry was generated, it is a valid BCD digit.
  3. If the sum produces a carry, the sum is invalid and the number 6 (0110) must be added to the digit.
  4. If the sum is greater than nine, the sum is invalid and the number 6 (0110) must be added to the digit.
  5. Repeat for each of the BCD digits.

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