title: Binary Subtraction with 2's Complement
body: <p>I need help subtracting with binary using 2's representation and using 5 bits for each number:</p>
  
  <p>1) -9 -7 = ? Is there overflow?</p>
  
  <p>-9 = 01001 (2's complement = 10111) and -7 = 00111 (2's complement = 11001)</p>
  
  <p>Now we need to add because we're using 2's complement</p>
  
  <p>10111
  +11001
  = 100000 But this answer doesn't make sense. Also, I'm assuming there's overflow because there are more than 5 bits in the answer.</p>
  
  <p>2)  6 - 10, same process as before. Negative binary numbers don't make sense to me</p>