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Problem: 7's complement subtraction 342-614 [ Calculator, Method and examples ]

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Your problem -> 7's complement subtraction 342-614

7's complement subtraction steps :

1. At first, find 7's complement of the B(subtrahend).
2. Then add it to the A(minuend).
3. If the final carry over of the sum is 1, then it is dropped and 1 is added to the result.
4. If there is no carry over, then 7's complement of the sum is the final result and it is negative.

Here A = 342, B = 614.
Find A - B = ? using 7's complement
First find 7's complement of B = 614

Note : 7's complement of a number is obtained by subtracting all bits from 777.
7's complement of 614 is
 7 7 7 - 6 1 4 1 6 3

Now Add this 7's complement of B to A

 1 3 4 2 + 1 6 3 5 2 5

Hints : (Move mouse over the steps for detail calculation highlight)
 Step-1=2+3=2+3=5=8xx0+5=5_8:. Sum=5 Step-2=4+6=4+6=10=8xx1+2=12_8:. Sum=2 and carry=1 Step-3=1+3+1=1+3+1=5=8xx0+5=5_8:. Sum=5

Here there is no carry, answer is - (7's complement of the sum obtained 525)

Note : 7's complement of a number is obtained by subtracting all bits from 777.
7's complement of 525 is
 7 7 7 - 5 2 5 2 5 2

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