Hi friend Number systems in Computing and informatics is a very important chapter. Because to get pass marks in Computing and informatics it has vital role. As we know Number systems has a mathematics type number. So you can score 20 marks out of 20 with your right answer. Stress on this chapter to get pass mark easily. That is why i post some topic which is very important for you. I give those link in bellow, click on that, read it and if you feel you need this as a study note simple copy that post and paste in word. I think those posts will bring you 20 out of 20. And all notes are prepared by me so go for that.
Number Systems
Decimal to binary number conversion
Decimal to octal number conversion
Decimal to hexadecimal number conversion
Step by step process of fractional number conversion to any other number systems