8 bit 2's complement - Middlesex University
LET - Maths, Stats & Numeracy
How to convert decimal numbers to 8 bit 2's complement
If you are not sure how to convert decimal numbers to 8 bit 2's complement form then have a look at this short video tutorial by PCC videos:
Here's an example:
Convert (? 47) into 8 bit 2's complement
Step 1) change the decimal number to binary 101111
Step 2) ensure the number is 8 bit by adding zero's to the left hand side 00101111
Step 3) invert the number by changing all the 1's to zero and all the zeros to 1 11010000
Step 4) add 1 to the right hand side 11010001
So the final answer is
? 47 = 11010001
Now try these:-
a) Convert the decimal number (? 5) into 8 bit 2's complement b) Change (? 21) into 8 bit 2's complement c) Express (? 67) as an 8 bit 2's complement number
ANSWERS a) 11111011 b) 11101011 c) 10111101
numeracy@mdx.ac.uk
Page 1
LET - Maths, Stats & Numeracy
Binary subtraction using 8 bit 2's complement
Computers do not manage direct subtraction very well. We can get round this problem by adding negative numbers when they are in 8 bit 2's complement form.
Here's an example:
150 - 47
Step 1) Convert the positive number into binary making sure it is 8 bits long, if it is too short just add zeros to the left hand side.
150 = 10010110
Step 2) Convert the negative number into 8 bits 2's complement form. DO NOT convert the positive number.
- 47 = 11010001
Step 3) Add the numbers together using binary addition. 10010110
+ 11010001 101100111
Step 4) Ignore any overflow: If you have a 9 bit number as your final answer,
ignore the biggest place value on the left hand side so that your answer is 8
bits long.
101100111
So the final answer is 01100111
Now try these:- 1) 15 ? 5
2) 77 - 21
3) 100 ? 67
ANSWERS 1) 00001010 2) 00111000 3) 00100001
numeracy@mdx.ac.uk
Page 2
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