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Method and examples
Complement Subtraction
7's Complement Subtraction
Number-1 Number-2

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7's Complement Subtraction calculator
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
777
-314

463


Now Add this 7's complement of B to A

1
402
+463

1065

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.
065
+ 1

066

So answer is 066




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