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Digital Arithmetic Operations and Circuits - Technical MCQs

Q1:

Convert the decimal numbers 275 and 965 to binary-coded decimal (BCD) and add. Select the BCD code groups that reflect the final answer.

A 1101 1110 1010

B 1110 1010 1110

C 0001 0010 0100 0000

D 0010 0011 0100 0000

ANS:C - 0001 0010 0100 0000

275 --> 0010 0111 0101
975 --> 1001 0111 0101
--------------------------------
1240--> 1011 1101 1010.

In BCD more than 1001 (>9), the number is INVALID, for Correction we need to ADD 0110 to each BCD No.

1011 1101 1010
0110 0110 0110
----------------------
1001001000000

Group the Final Ans in 4-bits each and for MSB 1 - append Three 0's at left. ie. 0001 0010 0100 0000 ==> In Decimal form ==> 1240.