# Digital Electronics - Digital Arithmetic Operations and Circuits - Discussion

### Discussion :: Digital Arithmetic Operations and Circuits - General Questions (Q.No.3)

3.

Perform subtraction on each of the following binary numbers by taking the two's-complement of the number being subtracted and then adding it to the first number.
01001        01100
00011        00111

 [A]. 01100    10011 [B]. 00110    00101 [C]. 10110    10101 [D]. 00111    00100

Answer: Option B

Explanation:

No answer description available for this question.

 Pavani said: (Aug 10, 2011) Take given data in the form of a, b then BCD subtraction= a+(9'scomplement of b) we get ans >9 then add 6 to the ans after msb is 1 that carry is added to the ans Given a=01001,b=00011 a+b=0110+1001=1111>9 1111+0110=1101 0101+1=00110

 Bala said: (Jun 16, 2015) Given: 1) 011001. 00011-->2's complement =11101. Add with 011001 we will get 00110. 2) 01100. 00111--->2's complement =11001. Add with 01100 we will get 00101. So answer is B 00110 00101.

 Shiv Babu Kushwaha said: (Sep 25, 2015) When we are subtracting any binary no using 2's compliment attention on it. Take binary no, which we want to subtract. Ex. A-B = (110011)-(011011). Take B = 011011. Find out 2's compliment of B. First find 1's compliment as convert it as '1' becomes 0 and '0' becomes 1. 1's compliment is B = 100100. Add 1 on LSB with 1's compliment. 2's compliment is B' = 100100. +1. B' = 100101. Then A+B' = 110011+100101. = 011000 this is our answer.

 Kiran V said: (Aug 20, 2020) Given: 01001 ->01001 -> 01001. 00011-> 1's Complement 11100. And 2's Complement -> 11101. Add Both the Numbers i.e 100110. Ignore the MSB then we will get -> 00110. Similarly, 01100 ->01100-> 01100. 00111 -> 1's Complement 11000 And 2's Complement ->11001 Add Both the Numbers i.e 100101. And finally, we get -> 00101.

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