Basic Binary Question?

Question

Hi could you please help me with this Binary Question:

Subtract these binary numerals by hand:

Q1. Ones complement

Q2. Twos complement

Q3. Straight binary arithmetic

Q4. Signed arithmetic and verify by hand addition

0110 1001 1110 1001

-

1011 0101 0001 1101

Thanks For You Help

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Answer 1

Im not sure.

1's complement:

~~~~~~~~~~~

   example:

   1111- 0001,Convert 0001 to reverse form i.e 1110 now subtract .

1111-1110=1

2's complement:

~~~~~~~~~~~~

   same as 1's complement but add one to the result

   1111-0001

  1111-1110=1 + 1= 10



3 rd n 4 th i dnt knw