7's Complement Subtraction calculator

SolutionHelp

1. 402 - 314 using 7's complement

2. 342 - 614 using 7's complement

Example

1. Find Subtraction of 402 and 314 using 7's complement method

Here A = 402, B = 314.
Find A - B = ? using 7's complement
First find 7's complement of B = 314

Note : 7's complement of a number is obtained by subtracting all bits from 777.
7's complement of 314 is



	7	7	7
-	3	1	4

	4	6	3

Now Add this 7's complement of B to A

1
	4	0	2
+	4	6	3

1	0	6	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 $=0+6$ $=0+6$ $=6$ $=8xx0+6$ $=6_8$ $:.$ Sum $=6$
Step-3 $=4+4$ $=4+4$ $=8$ $=8xx1+0$ $=10_8$ $:.$ Sum $=0$ and carry $=1$

The left most bit of the result is called carry and add it to the rest part of the result 065.


	0	6	5
+			1

	0	6	6

So answer is 066