Two’s compliment

Question 1

What does a 1 at the start of a binary number represent

Answer 1

A negative number

Question 2

What does a 0 at the start of a binary number represent

Answer 2

A positive number

Question 3

What is +1 in binary (8 digits)

Answer 3

0000 0001

Question 4

What is -1 in binary (8 digits)

Answer 4

1111 1111

Question 5

How to convert positive binary to negative binary (8 bit)

Answer 5

128 - number
Answer - closest bit repetitively until 0

Question 6

How to subtract two binary numbers

Answer 6

Convert one to negative and then do addition

Question 7

Unsigned binary vs signed binary

Answer 7

Unsigned binary is always positive
Signed binary can be positive or negative depending on the largest value

Question 8

What mathematical operations can processors carry out

Answer 8

Only addition

Question 9

How do processors subtract numbers

Answer 9

By converting one number to a negative and adding them together

Question 10

Another way to convert to a negative binary number

Answer 10

Find the number’s unsigned binary number
Put a 1 at the largest bit
From the right, keep everything the same until the first 1
After the first 1, swap every 0 for a 1 and every 1 for a 0