Summer computer holiday homework

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Across
  1. 3. this term is also equal to 6
  2. 6. this includes addition, subtraction, multiplication and division
  3. 7. an example of an antivirus software
  4. 9. it is a set of programs that disrupts the normal functioning of a computer
  5. 11. criminal activity intended to harm anyone using a computer and an internet connection
  6. 12. one such rule is 1-0=1
  7. 13. also known as the left most digit
  8. 15. making insults and sending threatening messages of social media
Down
  1. 1. consists of two numbers
  2. 2. has 16 digits consisting of numbers and letters
  3. 4. this is also equal to two nibbles
  4. 5. also known as base of a number system
  5. 8. is the use of illegal methods to get and steal money that belongs to a bank or it's customers
  6. 10. refers to the illegal entry into the computer system or network
  7. 14. a software meant to prevent unauthorised access to your computer