data representation

• binary addition rules (work right to left)

  
• what is an overflow error

  When the result of an addition is too large for the number of bits the computer works with
• what do left shifts do

  multiply
• what do right shifts do

  divide
• convert 8 into binary

  00001000
• hexadecimal is a number system which uses base 16
• a denary number is the standard system used across the world
• it only has 10 digits so it uses 0-9 then A-F

  
• binary is a number system that uses base 2
• base 2 means there are only two numbers, 0 or 1
• how to convert from binary to hex

  
• why do we use hex


  Much simpler to remember a hex value than a binary value

  Quicker to write or type

  Less likely to make an error with fewer characters

  Easy to convert to and from binary
• why does a computer use binary

  binary has two states 0 and 1, it can therefore represent the on and off electrical signals.