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Binary Operations- Binary Subtraction- How To Subtract Binary Number

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How do you subtract and add binary?  How do you subtract two binary complements?  What are the rules of subtraction?  What is 2's complement subtracti



 Binary Number Subtraction 

⇨ Three basic rules of subtraction are: 
(i) 0 - 0 = 0 
(ii) 1 - 0 = 1 
(iii) 10 -1 = 1

⇨ If we take borrow from the left column then every 0 becomes 10 (which means in binary 1+1) and If that 0 which is now becomes 10 donates to the next right it then it becomes 1 and the next one becomes 10 now and continuous in this pattern further.

 Example: Now lets try substracting 13 from 16. Binary for 13 is 1101 which for 16 is 10000. 

      Binary        Decimal
 1 0 0 0 0       1 6     
-    1 1 0 1    -  1 3      
 --------------------------
      0 0 0 1 1          3       
 --------------------------
⇨ 0 in the 1st column borrows from 0 in the 2nd column and so on till it get 1.

 Now 4th 0 from right side becomes 10 after borrowing 1 from the 5th number i.e. 1, and 5th  becomes 0 after donating 1 to the 4th 0.

⇨ Now 3rd 0 borrows 1 from 4th 0 and becomes 10 now by making  4th 0 as 1 (because 10 means 1+1 in binary, then after donating one 1, it only have one 1 left with it).

⇨ Now 2nd 0 borrows 1 from 3rd 0 and becomes 10 and makes 3rd 0 as 1(because 10 means 1+1 in binary, then after donating one 1, it only have one 1 left with it).

⇨ Now 1st 0 borrows 1 from 2nd zero and becomes 10 and makes 2nd 0 as 1 (because 10 means 1+1 in binary, then after donating one 1, it only have one 1 left with it).

⇨ Now 1st 0 = 10, 2nd 0 = 1, 3rd 0 = 1, 4th 0 = 1 and 5th 1 = 0.

⇨ Now substract 1st:10-1=1, 2nd: 1-0=1, 3rd: 1-1=0, 4th: 1-1=0
and 5th is already a 0.

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