1.1 Data Representation

• identify the units used to represent data in computers
• explain the representation of different types of data in computers
• describe the types of number systems used in computers
• convert numbers between different number systems
• represent data using different coding schemes
• acknowledge the importance of data representation in computers

“Why are different data units important in computing?”

“How are different number systems used in computer systems?”

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1. Units of data in a computer
   40 min · 1 practice tasks · quiz
   Name the units used to represent data in computers.
2. Data measurement units
   40 min · 1 practice tasks · quiz
   Use units for file size, storage and processing speed.
3. How computers store different data
   40 min · 1 practice tasks · quiz
   Explain how text, images, audio and video are stored.
4. Types of number systems
   40 min · 1 practice tasks · quiz
   Describe the number systems used in computers.
5. Features of number systems
   40 min · 1 practice tasks · quiz
   Explain radix and positional value.
6. Number systems in computing
   40 min · 1 practice tasks · quiz
   Match number systems to their uses in computing.
7. Converting from decimal
   40 min · 1 practice tasks · quiz
   Convert decimal numbers to binary, octal and hexadecimal.
8. Converting from binary
   40 min · 1 practice tasks · quiz
   Convert binary to octal, hexadecimal and decimal.
9. Converting between octal and hexadecimal
   40 min · 1 practice tasks · quiz
   Convert between octal and hexadecimal using binary.
10. Coding schemes
    40 min · 1 practice tasks · quiz
    Describe ASCII, EBCDIC and BCD and encode data.