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Digital Arithmetic Operations and Circuits - Technical MCQs

Q1:

Add the following BCD numbers.
0110   0111   1001
0101   1000   1000

A 0000  1011    0000  1111    0001  0001

B 0001  0001    0001  0101    0001  0001

C 0000  1011    0000  1111    0001  0111

D 0001  0001    0001  0101    0001  0111

ANS:D - 0001  0001    0001  0101    0001  0111

Correction code is not always 6 it is only for 10-19. And why 6 then the answer is for 10 BCD is 0001_0000 which is 16 in decimal and BCD is sequence of binary numbers. For 20-29 12 is add and so on.