3. Find Subtraction of 1789 and 1502 using 9's complementSolution: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 = 1789, B = 1502.
Find A - B = ? using 9's complement
First find 9's complement of B = 1502
Note : 9's complement of a number is obtained by subtracting all bits from 9999
Step-1: 9's complement of 1502 is obtained by subtracting each digit from 9999
Step-2: Now Add this 8497 to 1789
Step by step solution of 1789 + 8497 = 10286
Write the numbers, so that each digit lines up vertically
Step-1 :
`=9+7`
`=16`
Write the 6 in the sum place and carry the 1 to the next carry place
Step-2 :
`=1+8+9`
`=18`
Write the 8 in the sum place and carry the 1 to the next carry place
Step-3 :
`=1+7+4`
`=12`
Write the 2 in the sum place and carry the 1 to the next carry place
Step-4 :
`=1+1+8`
`=10`
Write the 10 in the sum place
The left most bit (1) of the result (10286) is called carry and add it to the rest part of the result (0286)
So answer is 0287
This material is intended as a summary. Use your textbook for detail explanation.
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