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Find 9's complement subtraction 670-831

Solution:
Your problem -> 9's complement subtraction 670-831

9's complement subtraction steps :

1. At first, find 9'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 9's complement of the sum is the final result and it is negative.

Here A = 670, B = 831.
Find A - B = ? using 9's complement
First find 9's complement of B = 831

Note : 9's complement of a number is obtained by subtracting all bits from 999.
9's complement of 831 is
 9 9 9 - 8 3 1 1 6 8

Now Add this 9's complement of B to A

 1 6 7 0 + 1 6 8 8 3 8

Hints : (Move mouse over the steps for detail calculation highlight)
 Step-1=0+8=8:. Sum=8 Step-2=7+6=13:. Sum=3 and carry=1 Step-3=1+6+1=8:. Sum=8

Here there is no carry, answer is - (9's complement of the sum obtained 838)

Note : 9's complement of a number is obtained by subtracting all bits from 999.
9's complement of 838 is
 9 9 9 - 8 3 8 1 6 1

So answer is -161

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