1. What is the number system used by computers? (1)
2. State two advantages of using binary numbers rather than decimal numbers in a computer system. (2)
3. The reserve price of a vase is £42·50. State how a real number such as 42·50 would be represented in the computer. (1)
4. A program calculates the average rainfall for one week as 18.6mm. Describe how floating point representation is used to represent real numbers. (2)
5. Convert the decimal number 13 into a binary number. (1)
6. Convert the following binary numbers in to decimal (2)
   1. 00001011
   2. 10011111
7. Convert the following decimal numbers into binary  (2)
   1. 63
   2. 193
8. Convert the binary number 11011 into a decimal number. (1)
9. State one reason why computer systems use binary numbers rather than decimal numbers. (1)
10. Convert the decimal number 27 into an 8 bit binary number. (2)

Total 15