1. Computer literacy Student name: sahar Instructor: issa Rosary school jabalamman

2. Topics Counting system Network

3. Counting system 1) Binary system. 2) Decimal system.

4. Binary system. Binary system: the numbering system that represent all numbers using just 2 symbols are (1,0) Back to menu

5. Decimal system. Decimal system: are consists of 10 symbols {0-9}

6. How to convert from decimal to binary? A) Comparison with descending powers of two and subtraction B) Short division by two with reminder

7. Comparison with descending powers of two and subtraction 1) To do this you have to double the number starting from 1. 2) You have to start subtraction the number you have from the doubling list but the number need to be the same or less

8. 3) After you finish the numbers you choose from the list you put under it 1 and what you didn’t use you put 0 under it.

9. 156 -128 28 -16 12 -8 4 -4 0 The operation 128-64-32-16-8-4-2-1 1 0 0 1 1 1 0 0 Back to menu

10. Short division by two with reminder When you want to do this operation you do a short division by two with remainder if the remainder was 0 you put 0 if it was 1 you put 1 when the answer is 1 you finish

11. The operation

12. How to convert from binary to decimal? A) Table method B) Doubling method

13. Table method On this method you have a numbers of {0&1}, on each number you write the doubling numbers from 1. you across out number 0 and combines the left numbers and the equal number represent the original number

14. The operation 16 8 4 2 1 1 1 0 1 1 27 =16+8+2+1 Back to menu

15. Doubling method On this method you double your number and add the next digit of the base two representation starting from zero & working from left to right

16. The operation 000110 0*2+0=0 0*2+0=2 0*2+0=0 1*2+1=3 3*2+1=7 7*2+0=14 Back to menu

17. Computers networks The computers network: is a system of interconnected computers that share files and other resources like printer. Data is transmitted in a digital form from one computer to another computer at a very high speed.

19. Computer network advantages 1) Sharing resources (files, applications or hardware, an internet connection, etc)

20. 2) Communication between people (email, live discussions, etc.). 3)Communication between processes (such as between industrial computers). 4) Multiplayer video games. 5) Exchange information.

21. Type of computers

22. Network topology 1)define 2) describes 3)types

23. Network topology The network topology defines the way in which computers, printers, and other devices are connected Back to menu

24. Network topology A network topology describes the layout of the wire and devices as well as the paths used by data transmission Back to menu

25. Network topology types 1)Bus topology 2)Ring topology 3)Star topology

26. Bus topology Back to menu

27. Ring topology Back to menu

30. See you soon! Bye!