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Grade 9 Computer, Explained

Nepal’s Grade 9 Computer Science curriculum, unit by unit in the order of CDC’s textbook, said clearly: number systems to work through, blocks and Python programs to run and step through, web pages to write, every exercise answered. For students with any Grade 9 computer book.

Start reading: Unit 1 · Computer System →

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  1. Unit 1 Computer System A laptop, a phone and an ATM are built from the same few parts. What does each part do, and why does a computer need both memory and storage? Computer systems  
  2. Unit 2 Number System A computer counts with only 0 and 1. How does it write the year 2082, add and subtract, and why do programmers also use base 8 and base 16? Computer systems  
  3. Unit 3 Block Programming Could you build a game, or a gadget that senses the world, without learning the strict rules of typed code first? Snap blocks together and see. Programming  
  4. Unit 4 Web Technology Every web page is a text file. Which tags make headings, links, tables and forms, and how does CSS turn plain text into a page worth visiting? Web and internet  
  5. Unit 5 Internet and Social Media You search, email and scroll every day. How do these tools really work, and how can you make them work for you, not the other way round? Web and internet  
  6. Unit 6 Cyber Security and Digital Citizenship Your phone holds your money, messages and photos, and strangers may try its doors. How do you keep them shut, and stay good company online? Safety and society  
  7. Unit 7 Concept of Programming A computer does exactly what it is told, nothing more. How do you plan instructions so exact that it can’t go wrong, and write them in Python? Programming  

Practice

How to use this book

Each unit covers its part of the curriculum in the order of CDC’s textbook, whose page numbers are under each unit’s title; whichever book your school uses, you can read it alongside. Inside you’ll find:

  • Worked examples: try them first; the answer stays hidden until you open it.
  • Try it questions and each unit’s questions at the end, with hints and answers to open when you’re ready.
  • Diagrams to play with: drag, slide and change things to see what happens.
  • Did you know? boxes with the stories and surprises behind the computers.

A companion to your textbook by Science Playground, not published by or connected with CDC, and not a replacement for the textbook: study from the book your school uses, and where the two differ, follow your teacher. Every fact here has been checked against the textbook and other reliable sources, but these pages have not yet been reviewed by subject experts. If you find a mistake, please tell us.