Binary Addition and Subtraction(1.4.1 d)

Question 1

Binary addition

Answer 1

0 1 0 1 1 1 0 1
1 0 0 0 0 1 1 0 +
1 1 1 = carries
————————
1 1 1 0 0 0 1 1

Question 2

Binary subtraction

Answer 2

0110 1011 - 0010 1011
0010 1011
flip = 1101 0100
add 1 = 1101 0101

0 1 1 0 1 0 1 1
1 1 0 1 0 1 0 1+
1 1 1 1 1 1 1 = carries
————————
0 1 0 0 0 0 0 0